Nervous System

These ingredients are often used in alternative medicine to support nervous system.

• 5-HTP (5-hydroxytryptophan)Scientific

  5-HTP is the direct biosynthetic precursor to serotonin and crosses the blood-brain barrier, raising CNS serotonin levels. Multiple double-blind, placebo-controlled trials have examined its efficacy for depression, insomnia, and anxiety. It has been used clinically for over 30 years and is produced commercially from Griffonia simplicifolia seeds.

• abies spectabilisScientific

  A. spectabilis has preclinically confirmed antianxiety, antidepressant, antistress, sedative, anticonvulsant, and analgesic activities, all involving the nervous system. These are listed among confirmed in vivo bioactivities in peer-reviewed pharmacological reviews.

• acetyl-L-carnitineScientific

  Acetyl-L-Carnitine (ALCAR) crosses the blood-brain barrier and supports neural energy metabolism, neurotransmitter synthesis, and nerve growth factor production. Clinical trials show benefit in mild cognitive impairment, Alzheimer's disease, and peripheral neuropathy. It is one of the most studied nutraceuticals for the nervous system.

• acetyl-L-tyrosineScientific

  Acetyl-L-Tyrosine is a more bioavailable form of L-tyrosine, a precursor to the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine. It is used to support neurotransmitter synthesis under conditions of stress or cognitive demand. Military and academic research has examined its role in sustaining cognitive performance under stress.

• agmatineScientific

  Agmatine, a decarboxylation product of L-arginine, acts as a neuromodulator in the central nervous system, binding to imidazoline, NMDA, and alpha-2-adrenergic receptors. Preclinical studies support roles in neuroprotection, pain modulation, and mood regulation. Limited but growing clinical data supports its use for neuropathic pain.

• AKG (alpha-ketoglutarate)Scientific

  AKG attenuates neuronal oxidative stress and senescence via mTOR pathway modulation, and in animal models it improves cognitive deficits, reduces brain oxidative damage, and rescues vestibulomotor dysfunction. In Alzheimer's model mice, Ca-AKG rescued hippocampal synaptic plasticity deficits. AKG is also used clinically to treat cyanide neurotoxicity.

• akkermansia muciniphilaScientific

  A. muciniphila participates in microbiota-gut-brain axis signaling relevant to neurological conditions including Parkinson's disease, Alzheimer's disease, multiple sclerosis, depression, and anxiety. It modulates GABA and serotonin precursor pathways, attenuates neuroinflammation via LPS/cytokine reduction, and regulates the HPA stress axis. Evidence comes primarily from animal models and human microbiome association studies, with limited direct human intervention data.

• ALA (alpha-linolenic acid)Scientific

  ALA is an essential nutrient for nervous system health with established neuroprotective, anti-neuroinflammatory, and neurotrophic properties. It protects against ischemic brain injury, neurodegeneration, and supports neuroplasticity through BDNF signaling.

• ALA (alpha-lipoic acid)Scientific

  Alpha-Lipoic Acid (ALA) is a mitochondrial coenzyme with potent antioxidant activity that crosses the blood-brain barrier and regenerates other antioxidants including glutathione. Multiple RCTs demonstrate its efficacy for diabetic peripheral neuropathy, a well-defined nervous system indication. Both oral and IV forms are used clinically.

• algal oilScientific

  DHA from algal oil is a fundamental structural component of neuronal membranes throughout the peripheral and central nervous system. It maintains membrane fluidity, supports neurotransmitter release and receptor function, and generates neuroprotective signaling molecules. Deficiency causes nervous system dysfunction; adequate DHA intake supports neurological health across the lifespan.

• allspiceScientific

  Allspice extracts demonstrate CNS depressant effects documented in animal studies, including hypotensive mechanisms mediated through autonomic ganglia. Polyphenol reviews list anxiolytic and antidepressant activities among allspice's biological properties. Eugenol acts on TRPV1 receptors relevant to pain signal processing.

• almondScientific

  Almonds' vitamin E, MUFAs, PUFAs, and mineral content support multiple aspects of nervous system function. Clinical RCT evidence shows improved cognitive performance in specific memory and spatial domains with high-dose almond consumption. Preclinical evidence demonstrates neuroprotection via antioxidant mechanisms and preservation of cholinergic neurotransmitter levels.

• alpinia galangalScientific

  A. galanga extracts exert neuroprotective effects via AChE inhibition, antioxidant protection of neural tissue, and anti-neuroinflammatory mechanisms. Multiple human RCTs of standardised extracts demonstrate psychostimulant effects including improved alertness, reduced fatigue, and better focus. A PMC review documents neuroprotective potential.

• amberScientific

  Amber bioactives (succinic acid, terpenoids) have demonstrated neuroprotective, sedative, and anticonvulsant activities in preclinical models. A 2022 PMC study showed amber extract protects dopaminergic human neuronal cells via ROS reduction and autophagy. TCM documents amber extensively for nervous system conditions.

• anchoviesScientific

  Anchovies provide DHA — the primary structural fatty acid of neuronal membranes — alongside vitamin B12, niacin, and selenium, all critical to nervous system integrity. DHA maintains membrane fluidity and supports synaptic function; vitamin B12 is required for myelin synthesis; selenium protects neuronal tissue from oxidative damage.

• anemarrhena asphodeloidesScientific

  Multiple anemarrhena constituents have significant documented effects on the nervous system, including AChE inhibition, hippocampal acetylcholine augmentation, neuroprotection against neurotoxins, and improvement of learning and memory in dementia and ischemia models. This is one of the most extensively researched areas of anemarrhena pharmacology.

• aniseScientific

  Anise demonstrates anxiolytic, antidepressant, tranquilizing, anticonvulsant, and morphine-dependence-reducing effects in preclinical models. Multiple independent animal studies confirm CNS activity of P. anisum extracts. Traditional use for melancholy, nightmares, anxiety, and seizures is documented across cultures.

• ashitabaScientific

  Angelica keiskei root compounds enhance nerve growth factor (NGF) production in cell assays (documented in a US patent). Ashitaba chalcones reduced demyelination and improved behavioral outcomes and BDNF levels in a mouse demyelination model. Traditional Japanese use attributed nerve-stimulating and vitality-restoring properties to the plant.

• ashwagandhaScientific

  Ashwagandha (Withania somnifera) is an Ayurvedic adaptogen with well-documented clinical evidence for reducing cortisol, stress, and anxiety through modulation of the hypothalamic-pituitary-adrenal (HPA) axis and GABAergic pathways. Multiple RCTs confirm reductions in stress and anxiety scores. Withanolides are key bioactive constituents.

• asparagusScientific

  A. racemosus has documented neuroprotective, adaptogenic, nootropic, anxiolytic, and antidepressant properties across preclinical and limited clinical studies, modulating GABAergic, serotonergic, dopaminergic, and HPA pathways. A PubMed review identifies A. racemosus nutraceuticals as showing neuroprotective and nootropic activity in both preclinical and clinical settings.

• aspartic acidScientific

  D-aspartic acid is an endogenous component of the vertebrate nervous system, found in neurons of the frontal cortex, hippocampus, and CNS broadly. It functions as a neuromodulator through NMDA receptor pathways, influences synaptic plasticity, and is biosynthetically converted to NMDA within nervous tissue. Its role in neural development and neuroendocrine function is well-documented.

• astaxanthinScientific

  Astaxanthin crosses the blood-brain barrier and has documented effects on neuronal oxidative stress, neuroinflammation, and cognitive function in human RCTs. A 2025 review confirmed its modulation of synaptic plasticity, neurogenesis, and neuroprotective pathways in aging. Human trials show improvements in memory, mood, fatigue, and cognitive performance at 6–12 mg/day.

• aster rootScientific

  Preclinical studies document that Aster root extract suppresses neuroinflammation in brain cell models and modulates hippocampal cholinergic and anti-apoptotic pathways relevant to memory and mood. Multiple PMC reviews list antidepressant and anti-neuroinflammatory activity among Aster root's pharmacological properties, supported by cell and animal studies.

• ATP (adenosine triphosphate)Scientific

  ATP is a well-established co-transmitter and neuromodulator that acts on both the central and peripheral nervous systems via purinergic receptors. A human RCT (Frontiers in Nutrition, 2023) found that 14 days of 400 mg oral ATP disodium prevented post-exercise declines in visuomotor reaction time and cognitive performance following high-intensity exercise. ATP's role as a neurotransmitter in pain signaling (nociception) is also documented in the literature.

• bacillus coagulansScientific

  B. coagulans modulates the enteric and central nervous systems via the gut-brain axis, with clinical evidence of effects on serotonin, dopamine, GABA, and NO neurotransmitter levels. The constipation RCT with BC99 showed regulation of neurotransmitter metabolic pathways, and IBS/depression RCTs showed normalization of neurotransmitters alongside symptom improvement.

• bacopaScientific

  Bacopa monnieri has been used in Ayurvedic medicine for centuries to enhance memory and cognition. Multiple RCTs demonstrate improvement in memory acquisition, retention, and processing speed in both healthy adults and those with cognitive impairment. The active constituents are bacosides, which support synaptic transmission and reduce oxidative stress in neurons.

• bacopinScientific

  Bacopin is a standardized, proprietary extract of Bacopa monnieri standardized to bacoside content. It shares the same nervous system evidence base as Bacopa monnieri, with clinical data supporting improved memory, cognition, and reduced anxiety through synaptic modulation and neuroprotection.

• bacosideScientific

  Bacosides are the primary active saponin glycosides isolated from Bacopa monnieri, responsible for its nootropic and neuroprotective effects. They modulate synaptic kinases, reduce oxidative damage, and enhance acetylcholine signaling in the hippocampus and cerebral cortex. Clinical trials using bacoside-standardized extracts confirm memory and cognition benefits.

• baikal skullcapScientific

  S. baicalensis exerts broad neuroprotective, anxiolytic, anticonvulsant, and neurotransmitter-modulating effects across multiple experimental systems. Its flavonoids interact with GABA-A receptors and dopaminergic systems, protect against neurodegeneration and ischemic brain injury, and have been studied in Alzheimer's, Parkinson's, and epilepsy models.

• bananaScientific

  Banana contains vitamin B6, tryptophan, magnesium, and potassium—all of which support neurotransmitter synthesis and nervous system function. Vitamin B6 is required for serotonin and GABA synthesis; tryptophan is the dietary precursor to serotonin; magnesium modulates NMDA receptor activity. Clinical and epidemiologic studies link these banana nutrients to reduced anxiety, depression, and improved mood.

• barberryScientific

  Berberine from barberry has neuroprotective, antidepressant-relevant, and anti-epileptic properties documented in preclinical studies. Gut-microbiome-brain axis modulation links barberry's microbiome effects to CNS outcomes. Herbal Reality notes berberine has antiepileptic effects as a pharmacological property.

• barrenwortScientific

  Icariin exerts multiple neuroprotective activities documented across animal models of Alzheimer's disease, Parkinson's disease, depression, cerebral ischemia, and multiple sclerosis. Mechanisms include anti-neuroinflammation, BDNF/TrkB signaling upregulation, amyloid-beta reduction, and Nrf2 activation. All neurological evidence is currently preclinical.

• basilScientific

  Multiple RCTs demonstrate holy basil's effects on the nervous system: stress reduction (n=158 RCT), cognitive improvement (n=40 RCT), HPA axis modulation, and cortisol lowering. Preclinically, basil polyphenols stimulate BDNF/NGF, reduce neuroinflammation, and protect against neurodegenerative changes. These are among basil's best-evidenced systemic effects.

• beetScientific

  Beetroot nitrate supports the nervous system by increasing NO-mediated cerebral blood flow and oxygenation. Betaine provides methyl groups for neurotransmitter synthesis (via SAMe). Some RCT evidence shows improved executive function and reduced cognitive fatigue, though effects are inconsistent.

• benegut perillaScientific

  The Benegut clinical program is mechanistically framed around gut-brain axis modulation: stress-driven nervous system signals cause ileum contractions and GI symptoms that Benegut's antispasmodic and anti-inflammatory properties address. Preclinical evidence links perilla flavonoids and rosmarinic acid to BDNF promotion and stress-coping behavior. Psychosocial quality-of-life improvement was reported in Benegut subjects.

• benfotiamineScientific

  The peripheral and central nervous systems are the primary documented targets of benfotiamine. Multiple RCTs show reduction in neuropathic symptoms in diabetic and alcoholic polyneuropathy. Mechanistically, it prevents AGE and PKC-mediated Schwann cell and axonal damage, reduces neuroinflammation via NF-κB and microglial suppression, and restores thiamine-dependent enzyme activity in neurons.

• berberineScientific

  Berberine exerts multiple neuroprotective actions: it inhibits neuroinflammation and oxidative stress, promotes hippocampal neurogenesis, modulates neurotransmitter systems, and influences the gut-brain axis. Preclinical evidence is extensive; clinical evidence includes improvement in depression scales in IBS patients and indirect neuroprotection via metabolic risk factor management.

• beta-alanineScientific

  BA plays a dual role in the nervous system: peripherally, it attenuates neuromuscular fatigue by buffering H⁺ at the neuromuscular junction region; centrally, it functions as a neuromodulator/neurotransmitter and is a precursor to neuroprotective carnosine. BA modulates GABAergic and glutamatergic neurotransmission, and carnosine upregulates glutamate transporter GLT-1, reducing excitotoxic glutamate accumulation in the CNS.

• beta-caroteneScientific

  Long-term beta-carotene supplementation (18-year follow-up in the Physicians' Health Study RCT) was associated with significantly better cognitive performance and verbal memory in men. Beta-carotene reduces neuroinflammatory cytokines TNF-α, IL-1β, and IFN-γ in neuronal cell models. NHANES cross-sectional data link higher dietary beta-carotene to lower risks of cognitive decline on multiple validated tests.

• betaineScientific

  Betaine is FDA-approved for homocystinuria (CBS deficiency), which causes severe neurological damage including cognitive impairment and psychiatric symptoms when untreated. The betaine-GABA transporter 1 (BGT-1) is expressed in brain tissue. Betaine's reduction of homocysteine protects the nervous system from hyperhomocysteinemia-induced neurotoxicity. Preclinical evidence supports betaine's role in neurodegeneration, excitatory/inhibitory balance, and CNS antioxidant defense.

• bifidobacterium bifidumScientific

  B. bifidum participates in gut-brain axis signaling through vagal nerve stimulation, GABA production pathways, tryptophan/serotonin metabolism, and production of short-chain fatty acids that influence the enteric and central nervous systems. Preclinical studies show B. bifidum supplementation attenuates neuroinflammation and anxiety-like behaviors, with reductions in hippocampal pro-inflammatory cytokines.

• bifidobacterium breveScientific

  B. breve influences the autonomic nervous system and broader nervous system function via the gut-brain axis. A human double-blind, placebo-controlled RCT showed B. breve M-16V decreased heart rate under stress and increased the GABA-like metabolite pipecolic acid in stool, consistent with modulation of autonomic nervous system balance. Preclinical data show B. breve can alleviate HPA-axis hyperactivity, enhance BDNF expression, and restore serotonin precursor levels.

• bifidobacterium lactisScientific

  Bifidobacterium lactis strains interact with the nervous system via the gut-brain axis, influencing neurotransmitter precursors (GABA, serotonin pathway), HPA-axis activity, and neuroinflammation. B. animalis CP-9 (a B. lactis relative) exerted antidepressant-like effects in mice via GABA/5-HT modulation. Multi-strain probiotics including B. lactis have shown anxiolytic effects in human trials.

• bifidobacterium longumScientific

  B. longum communicates with the nervous system through the microbiota-gut-brain axis, primarily via the vagus nerve. Preclinical evidence shows vagal integrity is required for NCC3001's anxiolytic effects. In healthy adults, B. longum 1714 altered EEG brain-wave patterns at rest and during social stress, demonstrating a measurable effect on central nervous system activity.

• bilobalideScientific

  Bilobalide is a sesquiterpene trilactone unique to Ginkgo biloba and one of its primary neuroprotective agents. It exerts anti-apoptotic effects on neurons, antagonizes PAF (platelet-activating factor), and protects against ischemia-induced neuronal death. It contributes to Ginkgo biloba's documented cognitive and neuroprotective effects in clinical trials.

• biota seedScientific

  Preclinical research has established multiple mechanisms by which biota seed components interact with the central nervous system, including modulation of serotonergic, GABAergic, and monoaminergic pathways. These mechanisms underpin its effects on sleep, anxiety, depression, and cognitive function documented in animal models.

• black cohoshScientific

  Black cohosh exerts documented activity on multiple central nervous system pathways, including serotonin, dopamine, and μ-opioid receptor systems. These interactions are mechanistically supported by in vitro and PET neuroimaging studies and underpin the herb's effects on vasomotor symptoms, mood, sleep, and pain.

• black cuminScientific

  Clinical trials show N. sativa improves memory, attention, cognition, mood, and reduces anxiety across two placebo-controlled human trials. Reviews document evidence for antidepressant, neuroprotective, and anticonvulsant effects. TQ modulates serotonin, GABA, acetylcholinesterase, and NO neurotransmitter systems.

• black pepperScientific

  Piperine crosses the blood-brain barrier, inhibits MAO-B (preserving dopamine and serotonin), protects neurons against multiple toxins, and demonstrates antidepressant, anxiolytic, and neuroprotective effects in preclinical models. Multiple animal and in silico studies document neurological activity, though human RCTs are absent.

• black spruceScientific

  Animal studies on Picea mariana essential oil have documented direct effects on the central nervous system — modulating serotonin receptors (5HT-1A, 5HT-2A) and GABA-A receptor expression relevant to mood, sleep, and relaxation. Bornyl acetate, the dominant constituent, mediates calming and sedating effects.

• black teaScientific

  Black tea's caffeine and L-theanine directly modulate central nervous system activity, improving alertness, attention, and stress resilience. Caffeine antagonizes adenosine receptors and L-theanine promotes alpha-wave brain activity. Multiple RCTs demonstrate acute CNS effects on cognition and stress responses.

• blackberryScientific

  Blackberry polyphenols protect neuronal cells from oxidative and apoptotic injury, modulate neuroinflammation, and support neurotrophic signaling. Wild blackberry extracts have been shown to reduce neuronal ROS and glutathione dysregulation in cell studies. Berry anthocyanins broadly improve cognitive and motor performance in aging models.

• blackboard treeScientific

  A. scholaris bark extracts show nootropic, anti-stress, analgesic, and neuroprotective activity in preclinical rodent studies. Memory augmentation in cognitive models, attenuation of neuropathic pain markers, and HPA-axis normalization have all been demonstrated.

• blueberryScientific

  Multiple human RCTs show blueberry supplementation improves memory, executive function, processing speed, and brain perfusion in older adults and children. fMRI evidence confirms increased activation and blood flow in cognitive brain regions.

• borage oilScientific

  GLA from borage oil is investigated for diabetic peripheral neuropathy, where it bypasses the impaired delta-6-desaturase step to restore PGE1 synthesis and endoneurial blood flow. Two of three RCTs using GLA (360–480 mg/day) showed significant improvements in nerve conduction velocity and neuropathy scores. Preclinical evidence also suggests borage oil neuroprotection in Alzheimer's models.

• boronScientific

  Human EEG studies and cognitive performance testing under controlled dietary boron manipulation (Penland 1994, Environ Health Perspect) established that low boron shifts brain electrical activity toward lower-alertness patterns and impairs attention, dexterity, and memory in older adults. Boron may affect neuronal membrane transport and neurotransmitter availability.

• boswelliaScientific

  Multiple human RCTs show Boswellia extracts improve neurological recovery after TBI and in multiple sclerosis, while animal studies demonstrate protection of dopaminergic neurons (Parkinson's model) and attenuation of neuroinflammation. The mechanism involves 5-LOX/NF-κB inhibition, antioxidant Nrf2 activation, and suppression of TNF-α and IL-1β in neural tissue.

• bovine heartScientific

  Bovine heart's high vitamin B12 content (~300% DV per 3 oz) is the primary nervous system relationship; B12 is scientifically essential for myelin maintenance, nerve conduction, and neurological function. CoQ10 has emerging neuroprotective evidence at the cellular level.

• bovine kidneyScientific

  Bovine kidney is a concentrated source of vitamin B12 (cobalamin), which is essential for myelin synthesis and neurological function. B12 deficiency causes progressive demyelination and neurological damage. The kidney also supplies riboflavin and other B vitamins with recognized roles in neuronal energy metabolism and neurotransmitter synthesis.

• bovine liverScientific

  Bovine liver's B12, choline, folate, B6, and biotin are each essential for peripheral and central nervous system structure and function. B12 deficiency causes demyelination of spinal cord and peripheral nerves — a clinically well-characterized syndrome directly addressable by liver consumption.

• boxthorneScientific

  LBPs are neuroprotective in multiple CNS and PNS models: retinal ganglion cell preservation in glaucoma, brain protection in stroke models, protection against beta-amyloid and glutamate-induced cortical neuron death, and anti-apoptotic effects in diabetic neuropathy. These span preclinical animal studies; human retinal evidence includes two RCTs in RP patients.

• broomrapeScientific

  Phenylpropanoid glycosides (echinacoside, acteoside) from broomrape family plants (Cistanche, Orobanchaceae) have demonstrated neuroprotective properties in preclinical models. A human open-label study in Alzheimer's disease using Cistanche glycoside capsules showed cognitive stabilization over 48 weeks. The memory-enhancing property of broomrape PPGs is recognized in peer-reviewed literature.

• bupleurum falcatumScientific

  B. falcatum extract and saikosaponins demonstrate neuroprotective and anti-neuroinflammatory effects in preclinical studies, including suppression of microglial and astrocyte activation, reduction of neuroinflammatory cytokines, and improvement of cognitive and behavioral outcomes in stress and neurodegeneration models.

• butterburScientific

  Butterbur's mechanisms of migraine prevention are directly nervous-system-mediated: petasins inhibit L-type voltage-gated calcium channels, suppress CGRP release from meningeal afferents, and desensitize nociceptive TRPA1 and TRPV1 ion channels. Multiple RCTs in migraine prophylaxis confirm clinically meaningful effects on neurological pain pathways.

• butyrate triglycerideScientific

  Butyrate acts on the nervous system via the gut-brain axis through vagal afferent signaling, BDNF upregulation via HDAC inhibition, reduction of neuroinflammation, and HPA axis modulation. A registered human RCT of tributyrin in MDD is underway. Preclinical evidence shows butyrate counteracts obesity-associated neurological changes. A human SCFA study showed reduced cortisol in stress conditions versus placebo.

• butyric acidScientific

  Butyrate modulates the nervous system via the gut-brain axis through enteric neurons, vagal signaling, and direct CNS access across the blood-brain barrier. It acts as an HDAC inhibitor in neural tissue, influencing neurotransmitter regulation and neuroinflammation.

• caesalpinia cristaScientific

  C. crista has documented activity across multiple nervous system-relevant pharmacological parameters: anticonvulsant, anxiolytic, nootropic, adaptogenic, and anti-amyloidogenic. These have been confirmed in multiple preclinical rodent studies using standard CNS models.

• caffeineScientific

  Caffeine is a methylxanthine that acts as an adenosine receptor antagonist in the central nervous system, producing stimulatory effects on alertness, attention, and cognitive performance. It is the most widely consumed psychoactive substance globally and has extensive clinical trial support for wakefulness, mood, and cognitive performance. Its nervous system effects are well-characterized.

• calamari oilScientific

  DHA and EPA from calamari oil are structural and functional components of the nervous system. DHA predominates in neuronal membranes and synapses, while EPA regulates neuroinflammation. Clinical evidence supports omega-3s in cognitive function, mood disorders, ADHD, and neuroprotection throughout the lifespan.

• camphor oilScientific

  Camphor's interaction with TRP channels (TRPV1, TRPV3, TRPA1, TRPM8) in sensory neurons constitutes a well-characterized pharmacological mechanism documented in peer-reviewed research. Camphor desensitizes nociceptors, producing analgesic and antipruritic effects. Historically it has been used as a local anesthetic and for nervous system disorders, with the mechanistic basis now confirmed in published neurophysiology research.

• caprylic acidScientific

  Caprylic acid underlies the MCT ketogenic diet used clinically for drug-resistant epilepsy, demonstrating direct nervous system relevance. C8-derived ketones cross the blood-brain barrier, support neuronal energy metabolism, and have anticonvulsant properties in animal models. MCT supplementation shows cognitive improvements in human trials involving neurological decline.

• capsaicinoidsScientific

  Capsaicin is a foundational tool in pain neuroscience and a clinically validated agent for multiple neuropathic conditions. TRPV1 is the primary target in sensory neurons; capsaicin-induced defunctionalization of C-fibers underpins FDA-approved pain therapy and is studied for central nervous system modulation.

• capsanthinScientific

  Capsanthin protected neuron-like cells against glutamate-induced excitotoxicity by reducing ROS, stabilizing antioxidant defenses, suppressing pro-inflammatory cytokines, and preserving mitochondrial ATP. These preclinical findings suggest neuroprotective potential.

• capsicumScientific

  Capsaicin's primary pharmacological action is on the peripheral nervous system via TRPV1 receptors on nociceptive C-fibers, with licensed pharmaceutical applications (Qutenza 8% patch) for peripheral neuropathic pain. It also modulates central pain processing through substance P depletion and effects on trigeminal pathways.

• caryophylleneScientific

  BCP exerts broad neuroprotection through CB2-mediated suppression of neuroinflammation, activation of Nrf2/NQO1 antioxidant pathways, protection of dopaminergic neurons, and attenuation of neuropathic pain across multiple preclinical models.

• cassia barkScientific

  A human clinical study showed activation of the olfactory cortex (a brain region) with cinnamon/cassia, and multiple preclinical studies demonstrate C. cassia's neuroprotective and anti-neuroinflammatory effects in hippocampal and CNS tissue. Traditional Chinese medicine also uses cassia bark for ischemic brain injury.

• cat's clawScientific

  Preclinical pharmacological studies have documented neuroprotective and memory-related effects of Uncaria tomentosa alkaloids. A 2000 pharmacology study found that 'total alkaloids exert a beneficial effect on memory impairment' in animal models. Pharmacological reviews confirm 'neuroprotective effects against Parkinson's and Alzheimer's diseases' in preclinical models.

• catalaseScientific

  Catalase deficiency is postulated in the pathogenesis of multiple neurodegenerative diseases including Parkinson's disease, Alzheimer's disease, and cognitive decline. Reduced catalase activity in the blood of PD patients is confirmed by meta-analysis. Mitochondria-targeted catalase protects brain vasculature and neurovascular coupling in aged animal models.

• catechinsScientific

  Catechins exert broad neuroprotective effects across the nervous system: they inhibit neuroinflammation and oxidative stress, protect dopaminergic neurons (relevant to PD), reduce amyloid-beta toxicity (relevant to AD), support BDNF-dependent neuroplasticity, and improve cognitive function in human trials.

• cauliflowerScientific

  Cauliflower's choline provides the substrate for acetylcholine synthesis and neuronal membrane phosphatidylcholine. Sulforaphane protects neural mitochondria via Nrf2 and reduces neuroinflammation via NF-κB inhibition. These mechanisms are supported by preclinical data and cholinergic neuroscience.

• cayenne pepperScientific

  Capsaicin acts on TRPV1 receptors—vanilloid-type ion channels—on sensory neurons throughout the peripheral nervous system, modulating pain, temperature sensation, and neurogenic inflammation. This mechanism underpins multiple clinically approved and evidence-based therapeutic applications in neuropathic pain.

• celeryScientific

  NBP, the primary phthalide in celery, has demonstrated neuroprotective activity across neurological conditions including stroke, Alzheimer's disease, Parkinson's disease, and depression in preclinical studies. A scoping review of 26 studies and one human RCT support celery's neurological relevance.

• chamomileScientific

  Chamomile (Matricaria recutita) has traditional use as a mild sedative and anxiolytic. Clinical trials demonstrate efficacy for generalized anxiety disorder, with active flavonoids (especially apigenin) binding to benzodiazepine/GABA-A receptor sites in the CNS. A long-term RCT also showed reduction in anxiety relapse.

• chaste treeScientific

  Vitex's active constituents interact with multiple central nervous system receptor types—dopaminergic, serotonergic, and opioid—providing mechanistic grounding for its effects on mood, pain threshold, and prolactin regulation. Preclinical data confirm receptor binding; clinical evidence of direct neurological outcomes is limited mainly to secondary endpoints in PMS/PMDD trials.

• chen piScientific

  Chen Pi's nobiletin and tangeretin are among the most investigated natural compounds for neuroprotection, showing activity against Alzheimer's and Parkinson's disease pathology in multiple in vitro and in vivo models. Human clinical evidence is not yet available.

• chinese salvia rootScientific

  Danshen exerts neuroprotective effects through multiple pathways including anti-neuroinflammation, antioxidant defense in neural tissue, and acetylcholinesterase inhibition. Tanshinone IIA protects hippocampal neurons against sleep deprivation, Alzheimer's pathology, and surgical trauma. Traditional use includes calming the mind and treating insomnia.

• chlorideScientific

  Chloride homeostasis is fundamental to neuronal excitability, synaptic inhibition, and action potential regulation in the central and peripheral nervous systems. Chloride flux through GABA-A receptors mediates the primary inhibitory signaling pathway in the brain. Dysregulation of chloride channels is implicated in epilepsy and other neurological disorders.

• cholineScientific

  Choline is an essential nutrient that serves as the direct precursor to acetylcholine, the primary neurotransmitter of the cholinergic nervous system. It also contributes to the structural phospholipids of neuronal membranes. Adequate choline is recognized by the NIH as necessary for normal brain development and cognitive function.

• chrysinScientific

  Chrysin exerts broad neuroprotective effects in preclinical models across multiple neurological conditions including anxiety, depression, epilepsy, Parkinson's disease, cognitive aging, and ischemic injury. It acts via GABAergic, serotonergic, and dopaminergic modulation, MAO-B inhibition, antioxidant effects, and anti-neuroinflammation.

• cinnamonScientific

  Cinnamon bioactive compounds (eugenol, cinnamaldehyde, cinnamic acid) improve cognitive function, reduce neuroinflammation, inhibit amyloid-beta aggregation, and improve brain insulin signaling in multiple animal models. A systematic review of 40 studies confirmed cognitive benefits; clinical human evidence is emerging but limited.

• citicolineScientific

  Citicoline (CDP-choline) is an endogenous intermediate in phosphatidylcholine biosynthesis that is used clinically to support neuronal membrane repair, acetylcholine synthesis, and cognitive function. Clinical evidence supports its use in cognitive impairment, stroke recovery, and traumatic brain injury. It is approved as a drug in several countries for neurological indications.

• citrus sinensisScientific

  C. sinensis essential oil and extracts act on the nervous system via olfactory-serotonergic pathways, with clinical evidence for anxiolytic effects and preclinical evidence for antidepressant-like activity. Upregulation of hippocampal 5-HT1A receptors and BDNF has been documented. Nitrergic neurotransmission is implicated as an anxiolytic mechanism.

• clerodendrum indicumScientific

  A 2019 study (Majumder et al., Bioresources and Communications) investigated in vitro antioxidant and in vivo neurobehavioral activities of C. indicum leaf extract specifically. This constitutes the only direct scientific study on the nervous system for this species. Traditional use includes epilepsy and febrile convulsions.

• cloveScientific

  Eugenol exerts documented effects on the nervous system including local anesthetic action via VGSC blockade, analgesic activity via TRPV1 antagonism, and traditional documentation of antinociceptive effects mediated through adrenergic and opioidergic pathways.

• cocoaScientific

  Cocoa contains neuroactive compounds including theobromine, caffeine, and flavanols that affect the CNS. RCTs demonstrate improvements in cognitive performance, mood, mental fatigue, and autonomic nervous system balance. Flavanols improve cerebral blood flow and oxygenation. Theobromine acts as an adenosine receptor antagonist.

• coconutScientific

  Coconut oil's MCTs provide ketone bodies that serve as an alternative neuronal energy substrate, with documented relevance to drug-resistant epilepsy via MCT ketogenic diets and to age-related neurodegeneration. The MCT ketogenic diet for epilepsy is established clinical practice. Neuroprotective effects in aging and neurodegeneration are supported by preclinical and small clinical trial data.

• coconut milkScientific

  MCTs from coconut milk are converted to ketone bodies that cross the blood-brain barrier and fuel nervous system function when glucose metabolism is impaired. VCO polyphenols and MCTs reduce neuroinflammation in animal models. MCT oil has shown cognitive improvements in multiple human studies relevant to the neurological aspects of aging and neurodegeneration.

• coconut oilScientific

  MCTs from coconut oil are converted to ketone bodies that serve as an alternative fuel for the nervous system when glucose metabolism is impaired. Human RCTs in Alzheimer's disease and MCI show improved cognitive outcomes with MCT/coconut oil supplementation. Animal studies demonstrate reduced neuroinflammation and amyloid-beta levels.

• cod liver oilScientific

  DHA is the dominant structural lipid of the brain and peripheral nervous system. Cod liver oil provides DHA for neuronal membrane maintenance, vitamin D for neuroprotection, and EPA for neuroimmune modulation. Clinical evidence links omega-3 status with memory, mood, and protection against cognitive decline.

• coffee fruitScientific

  Coffee fruit extract modulates the nervous system through BDNF elevation, CGA-mediated neuroprotection, and anti-neuroinflammatory effects. Clinical human studies confirm BDNF increases (central to nervous system maintenance), and preclinical data show CGA protects neurons against oxidative and amyloid-induced apoptosis, and reduces neuroinflammatory signaling.

• copperScientific

  Copper is required for myelination, neurotransmitter synthesis (dopamine β-hydroxylase), antioxidant protection of neurons (SOD1), and synaptic plasticity. Copper deficiency produces myelopathy and peripheral neuropathy in humans. The nervous system is among the most sensitive organ systems to copper status throughout the lifespan.

• coptis chinensisScientific

  Berberine from Coptis chinensis shows neuroprotective properties in animal studies of diabetes-induced cognitive impairment and Alzheimer's disease. Animal models of IBS demonstrate effects on spinal pain signaling via the microbiota-gut-brain axis. Pharmacological databases list berberine as having antiseizure and neuroprotective properties.

• CoQ10 (coenzyme Q10)Scientific

  CoQ10 is a recognized neuroprotective agent. CoQ10 levels are depleted in the mitochondria of Parkinson's disease patients, and animal/in vitro evidence demonstrates neuroprotective activity on nigrostriatal dopaminergic neurons. Clinical trials in Parkinson's and other neurodegenerative conditions have been conducted. It also has evidence in migraine prophylaxis and depression comorbid with multiple sclerosis.

• cordycepsScientific

  Cordyceps militaris demonstrates neuroprotective effects in ischemia and amyloid-beta models, protecting neurons from death and improving cognitive function. Cordycepin has anti-inflammatory and antioxidant effects in neural tissue and improves neurotransmitter levels associated with learning and memory. eNOS-mediated NO release in the nervous system is a proposed mechanism for its neuroprotective and cognition-enhancing effects.

• cowage seedScientific

  Cowage seed is a primary natural source of L-DOPA, a neurotransmitter precursor that directly supports dopaminergic nervous system function. Human clinical trials in Parkinson's disease confirm meaningful nervous system impact. Preclinical data confirm neuroprotection, anti-neuroinflammation, and acetylcholinesterase inhibition.

• creatineScientific

  Creatine functions as a neuromodulator in the central nervous system, acts as an energy buffer for neurons, and exhibits documented neuroprotective properties against oxidative stress and excitotoxicity in preclinical models. Human evidence for neuroprotection in neurodegenerative diseases has been inconsistent across trials, though brain bioenergetic effects are detectable by MRS.

• creatine monohydrateScientific

  Creatine monohydrate supports the nervous system through neuroprotective, neuromodulatory, and cellular energy mechanisms. Human clinical evidence shows cognitive improvements, and preclinical data demonstrates protection against excitotoxicity, neurodegeneration, and support for neurotransmitter systems including dopamine and serotonin.

• d-alpha tocopherolScientific

  Alpha-tocopherol is physiologically essential for neuromuscular health, as confirmed by hereditary deficiency states causing spinocerebellar ataxia and peripheral neuropathy in humans. It protects neuronal membranes from lipid peroxidation and supports neurological integrity across the lifespan.

• D-aspartic acidScientific

  D-Asp is an endogenous constituent of nervous tissue across invertebrates and vertebrates, found concentrated in synaptosomes, synaptic vesicles, and neuroendocrine tissues. It meets most classical neurotransmitter criteria and has documented roles in neural development, synaptic plasticity, and NMDA receptor-mediated signaling throughout the CNS.

• D-riboseScientific

  D-ribose has been studied in relation to the nervous system primarily through its role in ATP replenishment in neural tissue under ischemic or energy-deprived conditions. Preclinical evidence supports neuroprotective potential via the purine salvage pathway, and human CFS/FMS trials documented improved cognitive function (mental clarity) as a clinical endpoint.

• daidzinScientific

  Daidzin has a well-characterized preclinical neuroprotective and neuroactive profile including anxiolytic, antiepileptic, memory-enhancing, sedative, and antidepressant activities in animal models, primarily via GABAA receptor modulation and dopaminergic/cholinergic pathway interactions.

• damianaScientific

  Damiana and its constituents demonstrate multiple CNS-active mechanisms: GABA-A receptor modulation, MAO-B inhibition, monoamine reuptake inhibition, and glutamate receptor antagonism. These are supported by in vitro, animal, and pharmacological studies. The British Herbal Pharmacopoeia lists nerve tonic and anxiety neurosis as indications.

• delta-tocopherolScientific

  Tocotrienols related to delta-tocopherol have demonstrated neuroprotective effects in multiple experimental models of neurodegenerative disease. Delta-tocopherol itself is the most potent vitamin E isoform for reducing cholesterol accumulation in lysosomal storage models with neurological manifestations, including Niemann-Pick type C disease, where it corrects cholesterol trafficking and prevents neuronal death. Preclinical neuroprotection data are substantial; dedicated human clinical trials are lacking.

• DHA (docosahexaenoic acid)Scientific

  DHA is a long-chain omega-3 fatty acid that is the dominant structural lipid of neuronal membranes and synaptic vesicles. It is essential for normal brain development, synaptic plasticity, and neuroprotection. Multiple clinical studies support DHA supplementation for cognitive decline, depression, and infant neurodevelopment.

• DHEA (dehydroepiandrosterone)Scientific

  DHEA and DHEAS are neurosteroids that modulate GABA-A, NMDA, and sigma-1 receptors and easily cross the blood-brain barrier. They protect the hippocampus from glucocorticoid-induced damage, modulate mood, and influence memory. Declining DHEAS with aging is implicated in cognitive decline, and DHEA has beneficial effects on wellbeing and cognition across the lifespan.

• diamine oxidaseScientific

  Histamine is a major neurotransmitter and neuromodulator; DAO deficiency allows systemic histamine excess to affect the nervous system, producing headaches, migraines, sleep disruption, and neurological symptoms. DAO genetic variants are linked to neurological conditions including ADHD and migraine, and the enteric nervous system is directly affected by histamine dysregulation.

• DMEA (dimethylethanolamine)Scientific

  DMAE acts directly on the nervous system as a cholinergic agent, proposed to increase acetylcholine availability by modulating choline metabolism. It was used as a prescription drug (Deaner/Deanol) for central nervous system conditions including attention disorders and behavioral problems. Clinical trials have examined its effects on EEG brain activity, cognition, attention, and mood across several nervous system conditions. Effect on peripheral cholinergic neurotransmission has also been studied in the context of movement disorders (tardive dyskinesia).

• docosahexaenoic acidScientific

  DHA is the dominant structural omega-3 in the entire nervous system, comprising a major fraction of neural membrane phospholipids throughout the brain, spinal cord, and peripheral nerves. DHA is essential for neurogenesis, synaptogenesis, myelination, neurotransmitter function, and neuroprotection. Deficiency produces widespread neurodevelopmental and neurodegenerative consequences.

• dodderScientific

  Cuscuta species have documented neuroprotective, neurotrophic, and nootropic activities. C. chinensis extracts promote neural stem cell proliferation, improve memory deficits in multiple animal models, protect against cerebral ischemia, and reduce neuroinflammation in microglia. These properties are classified as statistically significant in the pharmacological literature.

• dogwoodScientific

  Both Cornus officinalis (preclinical neuroprotective data) and Jamaican dogwood (traditional CNS sedation, animal studies) have documented relationships with the nervous system. Cornus officinalis compounds protect against neurodegeneration, ischemia, and oxidative neuronal damage. Jamaican dogwood acts as a CNS depressant and antispasmodic.

• DPA (docosapentaenoic acid)Scientific

  DPA is incorporated into neuronal membranes and serves as a reservoir for EPA and DHA in neural tissue. DPA supplementation in aged rats reduced hippocampal microglial activation and oxidative stress, improving spatial learning. Reduced DPA in erythrocytes has been observed in patients with psychiatric conditions including schizophrenia.

• EGCG (epigallocatechin gallate)Scientific

  EGCG is among the most extensively studied natural neuroprotective compounds, with documented activity against amyloid-beta and alpha-synuclein aggregation, neuroinflammation, oxidative neuronal damage, and impaired mitochondrial function in neurons. Human clinical data support cognitive enhancement and neuroprotection.

• eggScientific

  Choline from egg yolk is the primary dietary precursor to acetylcholine, the neurotransmitter fundamental to nerve signal transmission, memory, and autonomic function. DHA and iodine in eggs further support neuronal membrane integrity and thyroid-mediated nervous system function throughout the lifespan.

• eicosapentaenoic acidScientific

  EPA supports nervous system function through neuroinflammation resolution, neurotransmitter modulation, autonomic tone regulation, and neuroprotection against apoptosis. EPA is the anti-inflammatory omega-3 most relevant to neuropsychiatric and neuroprotective outcomes, distinct from DHA's primarily structural role.

• EPA (eicosapentaenoic acid)Scientific

  EPA is an essential component of the brain and nervous system, influencing neuronal membrane fluidity, neurotransmitter signaling, and neuroinflammation. Clinical evidence links higher circulating EPA to reduced risk of depression, cognitive decline, and ADHD symptoms. EPA generates neuroprotective resolvins that resolve neuroinflammation.

• eucommiaScientific

  Eucommia has documented neuroprotective activity in multiple CNS models including Parkinson's (MPTP), stroke (MCAO), and Alzheimer's (Aβ). Mechanisms include Nrf2/HO-1 antioxidant defense, NLRP3 and NF-κB anti-inflammatory signaling, AChE inhibition, and dopaminergic neuroprotection. All evidence is preclinical.

• evening primrose oilScientific

  EPO has been studied specifically for diabetic peripheral neuropathy, where GLA is incorporated into peripheral nerve cell membranes and may restore nerve conduction. A 2025 RCT found significant reductions in neuropathic pain scores with 1000–2000 mg/day EPO. Multiple earlier trials also supported GLA's role in improving nerve conduction velocity in diabetic neuropathy.

• fava beanScientific

  Fava beans exert direct pharmacologically-relevant effects on the nervous system through L-DOPA, which crosses the blood-brain barrier and is converted to dopamine. Clinical studies in Parkinson's disease patients confirm significant neurological effects including improved motor function and prolonged 'ON' periods.

• ferula assafoetidaScientific

  Asafoetida acts on the nervous system via AChE inhibition (improving memory), anxiolytic and sedative effects (demonstrated preclinically), anticonvulsant mechanisms (via ferulic acid), and neuroprotection via the Nrf2/HO-1 pathway. Traditional use for hysteria, epilepsy, and nervous disorders is pervasive.

• ferulic acidScientific

  Ferulic acid is neuroprotective via Aβ inhibition, NADPH oxidase suppression, Nrf2/ERK activation, neuroinflammation reduction, and crossing of the blood-brain barrier. Animal models of Alzheimer's and Parkinson's diseases show significant neuroprotection. A clinical trial in MCI patients supports cognitive benefit. FA also demonstrates antidepressant-like properties in multiple preclinical models.

• fisetinScientific

  Fisetin is one of the most extensively studied flavonoids for nervous system protection, with evidence across Alzheimer's, Parkinson's, ALS, neuropathic pain, vascular dementia, depression, and ischemic stroke. One human clinical trial in acute ischemic stroke exists.

• fish oilScientific

  DHA is the most abundant omega-3 in the brain and peripheral nervous system, incorporated into neuronal synaptic membranes and myelin. Fish oil supports nervous system health through structural, anti-inflammatory, and neuroprotective mechanisms including production of neuroprotectin D1 (NPD1). Deficiency causes neuro-sensorial impairments in learning, memory, and anxiety.

• flaxseedScientific

  ALA omega-3 from flaxseed contributes to neuronal membrane integrity and supports production of neuroprotective mediators. An animal study showed flaxseed oil prevented cognitive and motor impairment and preserved prefrontal cortex neuronal morphology in hyperammonemia. Observational data link higher ALA intake with reduced cognitive decline.

• folic acidScientific

  Folic acid is critically important to nervous system development from the earliest embryonic stages, with periconceptional supplementation reducing neural tube defect (NTD) incidence by approximately 50–75%. Its role extends beyond NTD prevention: folate supports ongoing neurogenesis, myelination, and maintenance of neural progenitor cells throughout the lifespan. Folate deficiency increases homocysteine, which reduces proliferating neural progenitors in the hippocampus and disrupts normal neuronal development and survival.

• folinic acidScientific

  Folinic acid is a primary therapeutic agent for diseases of the nervous system caused by impaired cerebral folate transport, including FOLR1-deficiency syndromes and folinic acid-responsive seizures. It supports myelin integrity, CNS neurotransmitter synthesis, and neuronal DNA methylation. Evidence from case series, RCTs in ASD, and disease-specific interventions establishes its role in nervous system function.

• forsythiaScientific

  Forsythia suspensa active compounds, especially forsythoside A, have documented neuroprotective properties in preclinical models of Alzheimer's disease, Parkinson's disease, ischemic stroke, and peripheral neuropathy. Forsythia leaves and flowers show anti-aging properties relevant to neural health. Evidence is entirely preclinical; no human trials have been conducted.

• fritillaryScientific

  Fritillary alkaloids exhibit neuroprotective effects in preclinical models and inhibit acetylcholinesterase (AChE) and butyrylcholinesterase (BChE). Neuroprotection is listed as one of the thirteen confirmed pharmacological effects of FTB. Steroidal alkaloids also demonstrate sedative and analgesic properties relevant to nervous system function.

• fu lingScientific

  Poria cocos acts on the CNS via GABAergic (GABA-A BZD site activation, GAD65/67 upregulation), serotonergic, and dopaminergic pathways. Polysaccharides protect hippocampal neurons in AD models. Clinical human evidence supports sleep quality improvement, and preclinical evidence supports anxiolytic and antidepressant effects.

• fulvic acidScientific

  Fulvic acid inhibits tau protein aggregation in neuronal cells (in vitro), suppresses neuroinflammatory mediators, and supports mitochondrial energy in neural tissue. A 2025 systematic review found promising neuroprotective evidence. Traditional Ayurvedic use as a neural rejuvenator is established.

• GABA (gamma aminobutyric acid)Scientific

  GABA is the primary inhibitory neurotransmitter in the mammalian CNS. Oral GABA supplements have been studied for anxiety and stress, with some clinical evidence showing psychophysiological effects at doses of 100–800 mg. Evidence for direct CNS effects via oral supplementation is debated due to uncertain blood-brain barrier permeability.

• gamma oryzanolScientific

  Gamma oryzanol modulates the nervous system through hypothalamic ER stress reduction, monoaminergic pathway effects in the amygdala, HPA-axis attenuation, and neuroprotective effects against oxidative damage. Animal studies document anxiolytic and anti-stress effects mediated by reduced dopamine turnover and corticosterone levels.

• ganodermaScientific

  Ganoderma lucidum interacts with the nervous system through GABAergic, serotonergic, and neuroinflammatory pathways. Preclinical evidence shows sedation, sleep promotion, and neuroprotection in Alzheimer's models; human evidence from neurasthenia and fatigue RCTs supports CNS effects.

• gardeniaScientific

  Geniposide has neuroprotective activity in models of cerebral ischemia, Alzheimer's disease, Parkinson's disease, and depression. It crosses the blood-brain barrier and modulates MAPK/NF-κB and PI3K-Akt signaling to protect neurons. Crocin and gardenia volatiles also have sedative, anxiolytic, and central nervous system-regulating effects.

• gardenia jasminoidesScientific

  Gardenia jasminoides has the most extensively documented pharmacological activity in the nervous system among all body systems. Geniposide and genipin are neuroprotective across AD, PD, and ischemia models. Crocin and iridoids demonstrate antidepressant activity via CREB/PKA pathways. Gardenia volatile compounds reduce brain stress markers in human subjects. A 2024 ScienceDirect review systematically covers GJE's CNS neuropharmacology.

• genisteinScientific

  Genistein exerts neuroprotective effects through ER-β-mediated signaling in neural tissue, antioxidant activity, anti-neuroinflammatory mechanisms, and modulation of neurodegeneration-relevant pathways. Preclinical data are strong; clinical data are limited primarily to mixed isoflavone interventions showing modest cognitive benefits.

• geraniumScientific

  Geranium EO exerts neurologically relevant effects including HPA-axis modulation, glucocorticoid reduction, and limbic system activation via olfactory pathways. Multiple human RCTs confirm its psychophysiological effects on anxiety, stress, and mood. Mechanistic evidence for neuroprotection is also emerging.

• gingerScientific

  Ginger's bioactive compounds—particularly 6-gingerol and 6-shogaol—interact with 5-HT3 receptors (antiemetic effect), muscarinic receptors (GI motility), and have neuroprotective activity in preclinical models of neurodegeneration. Emerging rodent evidence suggests modulation of the gut–brain axis via microbiota changes and reduction of neuroinflammation.

• ginkgo bilobaScientific

  Ginkgo biloba (EGb 761 standardized extract) has extensive clinical trial evidence for improving cognitive function, slowing cognitive decline, and supporting cerebrovascular function. It acts via PAF inhibition, free radical scavenging, and enhancement of cerebral blood flow. Multiple systematic reviews and meta-analyses support its use in mild cognitive impairment and dementia.

• ginkgolidesScientific

  Ginkgolides are diterpene trilactones unique to Ginkgo biloba. Ginkgolide B is a potent platelet-activating factor (PAF) antagonist, contributing to improved cerebral blood flow and neuroprotection. They are key active constituents of standardized Ginkgo biloba extract (EGb 761) with documented nervous system effects.

• ginsengScientific

  Ginseng (Panax ginseng) has been used in East Asian traditional medicine for over 2,000 years to support mental performance, resilience to stress, and overall vitality. Clinical trials demonstrate improvements in cognitive performance, mood, and fatigue. Ginsenosides are the primary bioactive constituents that modulate neurotransmitter systems and neuroprotection.

• ginsenosidesScientific

  Ginsenosides are the primary active triterpenoid saponins of Panax ginseng responsible for its adaptogenic, neuroprotective, and cognitive-enhancing effects. Individual ginsenosides (Rb1, Rg1, Re, Rg3) have been studied for neuroprotection, acetylcholinesterase inhibition, and beta-amyloid suppression in animal models and early clinical research.

• GLA (gamma linolenic acid)Scientific

  GLA metabolites are structural components of neuronal membranes and are required for normal nerve conduction and blood flow in peripheral nerves. Clinical trials document that GLA supplementation significantly improves neurophysiological parameters, symptom scores, and thermal thresholds in diabetic peripheral neuropathy.

• glehnia littoralisScientific

  Multiple animal studies confirm neuroprotective, neurogenic, and anti-neuroinflammatory properties of G. littoralis. The 2019 systematic review confirms neuroprotective properties as established. GLE promotes hippocampal neurogenesis and protects against ischemic and scopolamine-induced neuronal damage in mice and gerbils.

• glehnia rootScientific

  Preclinical animal studies have demonstrated neuroprotective, neurogenic, and memory-improving effects of G. littoralis extract, including protection of hippocampal neurons from ischemic injury and upregulation of BDNF. Evidence is animal-only.

• glutamic acidScientific

  Glutamic acid is the predominant excitatory neurotransmitter in the central nervous system, mediating the vast majority of fast excitatory synaptic transmission. It is synthesized, stored, released, and reuptaken at nerve terminals throughout the brain and spinal cord. Its dysregulation is linked to epilepsy, neurodegenerative diseases, metabolic encephalopathies, and multiple psychiatric conditions.

• glycineScientific

  Glycine is a principal inhibitory neurotransmitter in the spinal cord and brainstem (via GlyRs), a mandatory NMDA receptor co-agonist in the forebrain, and the endogenous ligand for GPR158/mGlyR affecting mood circuits. Systematic review of 52 human studies found the nervous system showed the most consistent positive responses to glycine supplementation across psychiatric and healthy populations.

• goji berryScientific

  LBP exerts broad neuroprotective effects across the central and peripheral nervous system, including protection against stroke, neurodegeneration (Alzheimer's, Parkinson's), retinal ganglion cell damage, and hypoxia-induced neural injury. These effects operate via antioxidant, anti-inflammatory, anti-apoptotic, and neurogenic mechanisms documented in multiple peer-reviewed studies.

• GPC (glycerophosphocholine)Scientific

  Glycerophosphocholine (GPC, alpha-GPC) is a choline-containing phospholipid that delivers choline efficiently to the brain for acetylcholine synthesis. It is used clinically in Europe for cognitive decline and Alzheimer's disease, and multiple RCTs confirm cognitive benefits. It is considered one of the most bioavailable choline sources for the nervous system.

• grapeScientific

  Grape-derived polyphenols suppress neuroinflammation and oxidative stress—mechanisms underlying multiple neurodegenerative conditions. A review (PubMed 30210334) discusses grape polyphenols as adjunctive treatment for Alzheimer's, Parkinson's, and CTE by addressing inflammation and oxidative stress. GSE has been shown to improve cardiac autonomic function in human studies. Resveratrol penetrates the blood-brain barrier in human trials.

• greek mountain teaScientific

  GMT acts as a triple monoamine reuptake inhibitor (serotonin, noradrenaline, dopamine) in vitro, has neuroprotective activity in Alzheimer's preclinical models, and has demonstrated enhanced cerebral blood flow, reduced anxiety, and improved cognitive performance in human RCTs. This makes the nervous system the best-supported system for GMT's pharmacological effects.

• green teaScientific

  Green tea's bioactive compounds—EGCG and L-theanine—exert well-documented neuromodulatory effects in humans. L-theanine crosses the blood-brain barrier, promotes alpha-wave activity, modulates glutamatergic and GABAergic systems, and counteracts caffeine-induced overstimulation. EGCG provides neuroprotection by reducing amyloid toxicity, neuroinflammation, and oxidative stress, with clinical evidence from cognitive and mood trials.

• griffonia simplicifoliaScientific

  Griffonia simplicifolia seeds are the primary commercial source of 5-HTP (5-hydroxytryptophan), the direct serotonin precursor. Seeds contain up to 20% 5-HTP by weight. The plant's nervous system relevance is entirely through its 5-HTP content, which crosses the blood-brain barrier and elevates CNS serotonin.

• guaranaScientific

  Guarana is a well-documented CNS stimulant acting through adenosine A1/A2A receptor blockade by caffeine, preventing inhibitory adenosine signaling and enabling alertness, reduced fatigue perception, and faster cognitive processing. It also demonstrates neuroprotective, anxiolytic, and cholinergic-preserving activities in preclinical models.

• hericenonesScientific

  Hericenones are aromatic compounds from the Lion's Mane mushroom (Hericium erinaceus) fruiting body that stimulate nerve growth factor (NGF) synthesis in neurons and Schwann cells. Together with erinacines (from mycelium), they are responsible for Lion's Mane's neurotrophic effects on the central and peripheral nervous system.

• hesperetinScientific

  Hesperetin exhibits neuroprotective properties in preclinical models, reducing neuroinflammation, oxidative stress in neural tissue, and demonstrating potential in models of neurodegeneration. Evidence is primarily from animal and cell studies; direct human clinical trials are limited.

• hesperidinScientific

  Hesperidin crosses the blood-brain barrier and exerts neuroprotective effects across multiple neurodegenerative disease models including Alzheimer's, Parkinson's, Huntington's, and multiple sclerosis. It improves neural growth factors, antioxidant defenses, and reduces neuroinflammation. Limited human trials show improved cognitive function and cerebral blood flow.

• HMR (7-hydroxymatairesinol)Scientific

  HMR/lignan demonstrated neuroprotective effects in a rat 6-OHDA model of Parkinson's disease, slowing degeneration of striatal dopaminergic terminals and improving motor function. The mechanism involves anti-neuroinflammatory and antioxidant actions. Reviews also identify HMR as protecting dopaminergic neurons and motor function in PD models.

• HMR lignanScientific

  Oral HMRlignan reaches brain tissue after systemic absorption, confirmed in rats. In a rodent Parkinson's disease model, chronic HMRlignan treatment slowed nigrostriatal dopaminergic degeneration and improved motor performance. The neuroprotective mechanism is attributed to anti-inflammatory and antioxidant activity at the central level. No human neurological trials have been conducted.

• ho woodScientific

  Ho wood essential oil is exceptionally rich in linalool (95–99%), which has been shown in multiple peer-reviewed studies to exert anxiolytic and sedative effects via GABAergic transmission. A 2018 study (Frontiers in Behavioral Neuroscience) demonstrated that inhaled linalool odor produced significant anxiolytic effects in mice without motor impairment, mediated by benzodiazepine-responsive GABA-A receptors. A 2023 PMC review further documents linalool's antidepressant, anticonvulsant, and sedative CNS actions, including modulation of NMDA receptors and serotonin reuptake inhibition.

• hopsScientific

  Hops exerts central nervous system depressant effects via GABA-A receptor positive modulation (humulone), melatonin receptor binding, serotonin receptor interaction, and hypothermic activity. These are supported by preclinical behavioral models and consistent with human clinical evidence from RCTs of hops-valerian combinations for sleep and mood.

• huperzine AScientific

  Huperzine A is a highly specific and reversible inhibitor of acetylcholinesterase, extracted from the Chinese herb Huperzia serrata (club moss). It raises acetylcholine levels in the brain and has been studied in multiple clinical trials for Alzheimer's disease, age-related cognitive decline, and memory improvement. It is used as a pharmaceutical drug in China.

• hydroxymatairesinolScientific

  HMR and its metabolites cross the blood-brain barrier and accumulate in brain tissue after oral dosing in rodents. In the 6-OHDA rat PD model, HMR reduced neuroinflammation in the substantia nigra and striatum, decreased microglial/astrocyte markers, and attenuated motor deficits. Its anti-inflammatory and estrogen-like properties are proposed as the central mechanistic basis. All evidence is preclinical.

• indian baelScientific

  Preclinical studies document Aegle marmelos effects on the central nervous system including antidepressant-like activity via HPA axis normalization and serotonergic modulation, anxiolytic effects, anticonvulsant activity, and neuroprotection against oxidative neuroinflammation in hippocampus and prefrontal cortex.

• indian frankincenseScientific

  Boswellia serrata demonstrates neuroprotective properties — animal studies show BDNF upregulation, protection of dopaminergic neurons, and anti-inflammatory activity in the CNS. A human RCT in traumatic brain injury showed significant cognitive benefits. A 2025 RCT showed improved BDNF levels and cognitive performance in ageing adults.

• indian sarsparillaScientific

  Neuroprotective properties of H. indicus are listed among its confirmed pharmacological properties in comprehensive reviews. Acetylcholinesterase and butyrylcholinesterase inhibitory activity has been documented in preclinical studies, relevant to neurotransmitter modulation. Ayurvedic texts describe memory-enhancing and stress-relieving properties.

• indian tinosporaScientific

  T. cordifolia demonstrates neuroprotective, adaptogenic, and cognitive-enhancing properties supported by both human and animal data. A human RCT (Bairy 2004, n=30) showed improved verbal and logical memory. Animal studies demonstrate protection against hippocampal neurodegeneration, monoamine restoration, and anxiety reduction in sleep-deprived rats. It is classified as a Medhya Rasayana (intellect-promoting) in Ayurveda.

• inositolScientific

  Inositol is a substrate for the phosphatidylinositol second messenger system that mediates serotonin, norepinephrine, and other neurotransmitter receptor signal transduction. CSF inositol levels are reduced in depression, anxiety disorders, and OCD. Clinical RCTs have tested inositol (typically 12–18 g/day) for panic disorder and depression with mixed but mechanistically grounded results.

• iodineScientific

  Iodine is essential for thyroid hormone synthesis, and thyroid hormones are critical regulators of nervous system development and adult neural function. Deficiency during critical developmental windows causes irreversible damage including impaired myelination and neuronal migration. In adults, iodine-deficiency hypothyroidism produces neurological symptoms including cognitive slowing, ataxia, and peripheral neuropathy. The nervous system is a primary target organ of thyroid hormone action.

• ironScientific

  Iron is an indispensable cofactor for nervous system function, required for myelination of axons, synthesis of neurotransmitters (dopamine, serotonin, norepinephrine), mitochondrial energy metabolism in neurons, and DNA synthesis. Iron deficiency during critical developmental windows causes lasting neurological deficits in myelination and dopaminergic signaling. Both iron deficiency and pathological iron accumulation are associated with a range of neuropsychiatric and neurodegenerative disorders.

• jiaogulanScientific

  Jiaogulan gypenosides protect the nervous system via antioxidant, anti-inflammatory, neurogenic, and cholinesterase-inhibiting mechanisms. Evidence spans rodent models of Parkinson's disease, cerebral hypoperfusion, and depression, and is reviewed in a 2026 ScienceDirect neuroprotection review.

• jujubeScientific

  Jujube seed and fruit extracts modulate GABAergic and serotonergic neurotransmission, produce anxiolytic and sedative effects, inhibit acetylcholinesterase, enhance ChAT, and protect neurons against oxidative injury via Nrf2/ARE. Preclinical neuroprotective evidence spans anxiety, insomnia, memory, epilepsy, and neurodegeneration models.

• kannaScientific

  Kanna's primary pharmacological target is the central nervous system. Its alkaloids modulate multiple CNS neurotransmitter systems including serotonin, noradrenaline, dopamine, GABA, and the cAMP/CREB pathway via PDE4. It is commercially used for CNS-related disorders and has been evaluated in multiple human clinical CNS trials.

• kavaScientific

  Kava (Piper methysticum) is a traditional South Pacific ceremonial and medicinal plant with well-documented anxiolytic effects via modulation of GABA receptors, ion channels, and monoamine systems. Multiple RCTs and a meta-analysis support its use for generalized anxiety disorder. It is approved in several countries for anxiety and insomnia.

• kavalactonesScientific

  Kavalactones are the primary psychoactive constituents of Piper methysticum (kava), mediating its anxiolytic and neuroprotective effects through GABA-A modulation, ion channel blockade, and monoamine reuptake inhibition. Clinical trial evidence for anxiety disorder treatment derives specifically from kavalactone-standardized extracts.

• knotweedScientific

  Knotweed's phytochemicals cross the blood-brain barrier and exert neuroprotective effects. Resveratrol activates SIRT1, inhibits Aβ aggregation, upregulates BDNF, and reduces neuroinflammation. Human systematic review evidence shows resveratrol improved cognitive scores in mild cognitive impairment. Knotweed is listed in Chinese medicine for treating dizziness and headaches.

• krill oilScientific

  Krill oil provides DHA and EPA in phospholipid form for direct incorporation into neural membrane phospholipids. The Konagai 2013 RCT demonstrated improved prefrontal cortex activation and working memory in elderly adults. Multiple animal studies confirm krill oil attenuates neuroinflammation, oxidative stress, and neuronal apoptosis.

• kudzuScientific

  Puerarin can cross the blood-brain barrier and exerts neuroprotective effects in multiple preclinical models of ischemia, neurodegeneration, and toxic injury. It reduces neuronal apoptosis, inhibits oxidative stress in neural tissue, and improves cognition in animal models. It is used clinically in China for cerebrovascular diseases.

• L-asparagineScientific

  L-asparagine is critical for nervous system development and ongoing neurological function. Human genetic studies show that loss of asparagine synthetase causes severe neurological disease (ASNSD), characterized by microcephaly, epileptic encephalopathy, and brain atrophy. L-asparagine cannot cross the blood-brain barrier freely, so the nervous system depends on intrinsic synthesis. In the mature CNS, asparagine underpins aspartate-mediated excitatory neurotransmission and the malate-aspartate shuttle in neurons.

• l-carnitineScientific

  ALC supports peripheral and central nervous system function through NGF promotion, myelin maintenance, cholinergic neurotransmission, and mitochondrial energy support in neurons. Clinical evidence spans peripheral neuropathic pain, depression, cognitive decline, and hepatic encephalopathy. A 2024 systematic review confirms LC's role in psychiatric and neurological disorders.

• L-carnosineScientific

  L-carnosine is present in brain tissue and olfactory neurons, protecting against neurodegeneration through antioxidant, anti-inflammatory, metal-chelating, and anti-aggregation mechanisms. Human clinical evidence includes improved cognitive outcomes in elderly RCTs, a Parkinson's disease pilot trial, and investigation in neurodevelopmental disorders.

• L-cysteineScientific

  L-cysteine/NAC modulates the nervous system via glutamate homeostasis, neuroinflammation reduction, and neuronal GSH replenishment. Clinical trials in depression, bipolar disorder, schizophrenia, Alzheimer's disease, and neuropathic pain have yielded promising results. NAC is one of the most studied nutritional adjuncts in neuropsychiatry.

• L-glutamineScientific

  Glutamine is the primary precursor to both glutamate (the main excitatory neurotransmitter) and GABA (the main inhibitory neurotransmitter), cycling between neurons and astrocytes. Disturbances in glutamine metabolism are linked to hepatic encephalopathy and other neurological conditions.

• L-glutathioneScientific

  Neurons depend on astrocyte-derived GSH and its metabolites for antioxidant defense; GSH deficiency is mechanistically linked to neurodegenerative diseases including Alzheimer's and Parkinson's. GlyNAC clinical trials in older adults have corrected brain GSH deficiency and improved multiple neurological parameters including cognitive function, BDNF, and mitochondrial function.

• L-glycineScientific

  Glycine is a major inhibitory neurotransmitter in the spinal cord and brainstem, and an obligate co-agonist at NMDA receptors throughout the CNS. These dual roles make glycine essential for both inhibitory spinal circuits and excitatory synaptic plasticity. Clinical trials in schizophrenia demonstrate that modulating glycine levels at NMDA receptors has measurable effects on CNS function.

• L-histidineScientific

  L-histidine is the obligate precursor of the neurotransmitter histamine in the CNS, where histaminergic neurons from the tuberomammillary nucleus regulate arousal, anxiety, appetite, cognition, and the sleep-wake cycle. Histidine crosses the blood-brain barrier via stereoselective transport, and insufficient intake demonstrably reduces brain histamine and alters neurological function.

• L-methionineScientific

  L-methionine is indispensable for nervous system function as the precursor to SAMe, which provides methyl groups for myelin synthesis (phosphatidylcholine, phosphatidylethanolamine), epigenetic regulation of neural genes, and biosynthesis of dopamine, serotonin, and noradrenaline. SAMe deficiency impairs myelination and monoamine production. Clinical evidence supports SAMe's role in depression treatment and its interaction with Parkinson's medications.

• L-ornithineScientific

  L-ornithine is CNS-active, with documented GABA-A receptor modulatory effects in animal models that attenuate stress responses. It increases striatal serotonin metabolite (5-HIAA) concentrations, supporting neurotransmitter balance. Human RCTs demonstrate significant effects on POMS mood subscales (tension-anxiety, anger, fatigue) consistent with modulation of central nervous system stress circuitry.

• L-phenylalanineScientific

  L-phenylalanine is a critical precursor for the biosynthesis of the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine, all of which are central to nervous system function. Brain catecholamine synthesis rates are sensitive to phenylalanine and tyrosine availability in the physiological range. This relationship is supported by extensive biochemical, depletion, and pharmacological human studies.

• L-serineScientific

  L-serine is synthesized primarily in the central and peripheral nervous systems and is essential for neuronal development, myelination, neurotransmitter production, and structural membrane integrity. Genetic deficiencies in L-serine biosynthesis cause severe neurological disease, and supplemental L-serine is clinically prescribed for serine-deficiency nervous system disorders. L-serine also exerts neuroprotective effects in peripheral neuropathy (HSAN1).

• L-theanineScientific

  L-Theanine is an amino acid found in green and black tea that crosses the blood-brain barrier and promotes relaxed alertness by increasing alpha brain wave activity and modulating GABA, serotonin, and dopamine. Multiple RCTs demonstrate reductions in acute stress, improvements in sleep quality, and enhanced cognitive performance when combined with caffeine.

• L-threonineScientific

  L-Threonine is catabolized to glycine in the central nervous system, elevating glycine concentrations in the brain and spinal cord. Glycine is a principal inhibitory neurotransmitter in the spinal cord, and this pathway has been validated by human CSF amino acid measurements during threonine supplementation. Clinical trials have confirmed that L-threonine has a measurable, if modest, antispastic effect in patients with spinal cord disorders.

• L-tryptophanScientific

  L-Tryptophan is an essential amino acid and the dietary precursor to serotonin in the CNS. As the sole precursor to serotonin, its plasma levels directly influence brain serotonin synthesis. Clinical trials show antidepressant effects and improvements in mood, sleep, and cognitive function. Acute depletion studies confirm its central role in serotonergic neurotransmission.

• l-tyrosineScientific

  L-tyrosine is a conditionally essential amino acid and the direct precursor to the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine. Clinical research demonstrates that supplementation maintains cognitive performance and mood during acute stress, cold, or sleep deprivation by replenishing catecholamine stores depleted under these conditions.

• L-valineScientific

  In the CNS, BCAAs including valine participate in neurotransmitter synthesis, protein synthesis, and food intake regulation. Valine competes with tryptophan at the blood-brain barrier via the LAT1 transporter, modulating serotonin precursor availability. BCAAs including valine serve as amino group donors for glutamate synthesis in the brain. Animal studies specifically show L-valine prevents exercise-induced serotonin release in the rat hippocampus.

• lactobacillus caseiScientific

  L. casei Shirota has been shown to affect autonomic nerve activity in animal studies, regulating glucose and lipid metabolism through neural pathways. The gut-brain axis mechanism involves vagal afferent signaling, HPA axis modulation, and neurotransmitter precursor production. Stress-model RCTs and preclinical BDNF-pathway data establish a scientific link between L. casei and the nervous system.

• lactobacillus gasseriScientific

  L. gasseri CP2305 modulates the nervous system via the gut-brain axis, demonstrated by reductions in anxiety, stress biomarkers (salivary cortisol), and sleep disturbance in multiple human RCTs. Brain alpha oscillatory activity has been assessed in a 2026 crossover RCT, providing direct neurophysiological evidence of CNS effects.

• lactobacillus paracaseiScientific

  L. paracasei influences the nervous system via the gut-brain axis. Animal studies demonstrate L. paracasei CCFM1229 reduces depressive and anxiety behavior and maintains CNS myelin integrity. L. paracasei PS23 reduces corticosterone and increases IL-10 in early-life stress models. Human RCTs of PS23 and Lpc-37 show improvement in trait anxiety and sleep outcomes in stressed populations.

• lactobacillus plantarumScientific

  Multiple RCTs and a systematic review support L. plantarum's role in nervous system regulation via the gut-brain axis, with documented effects on cortisol, neurotransmitter precursors, GABA, anxiety, depression, and cognitive function.

• lactobacillus rhamnosusScientific

  L. rhamnosus modulates the nervous system via the gut-brain axis, influencing GABA synthesis, BDNF levels, HPA axis activity, and neuroinflammation. Preclinical studies show LGG reduces noise-induced cognitive deficits and neuroinflammation. Clinical RCTs demonstrate effects on postpartum anxiety and depression, which are mediated through central neuroendocrine pathways.

• lavenderScientific

  Lavender (Lavandula angustifolia) and its oral formulation (Silexan 80 mg/day) have clinical evidence for anxiolytic effects comparable to low-dose benzodiazepines, with GABAergic and serotonergic mechanisms. Silexan is approved in Germany for mixed anxiety disorder. Multiple RCTs support its use for anxiety, sleep, and nervous system calming.

• lecithinScientific

  Lecithin is a dietary precursor of choline, which is the biosynthetic precursor of acetylcholine — the primary neurotransmitter of both the central and autonomic nervous systems. Animal data confirm lecithin consumption raises brain acetylcholine; clinical trials have examined lecithin for movement disorders (tardive dyskinesia) and neurological conditions with cholinergic involvement.

• lemon balmScientific

  Lemon balm (Melissa officinalis) has traditional use in European herbal medicine for anxiety and insomnia. Rosmarinic acid and other phenolics inhibit GABA transaminase, increasing synaptic GABA levels. Multiple RCTs demonstrate acute and chronic reductions in anxiety, stress, and insomnia when used alone or in combination with valerian.

• lilyScientific

  Lily bulb has documented neuroprotective, antidepressant, sedative, and anxiolytic pharmacological effects in preclinical models. Saponins, polysaccharides, and alkaloids modulate neurotransmitter systems including monoamine pathways. Classical TCM formulas for depression and insomnia target nervous system imbalances. A 2025 PMC systematic review lists neuroprotective activity as a demonstrated bioactivity.

• limoneneScientific

  Limonene has multiple documented interactions with the nervous system: it modulates dopaminergic, GABAergic, and serotonergic neurotransmission via adenosine A2A receptors; exerts anxiolytic, antidepressant-like, and anti-stress effects in animal models; and has demonstrated anxiety-reducing effects in human clinical settings. It also shows neuroprotective antioxidant properties against Aβ-induced neurotoxicity.

• lion's maneScientific

  Lion's Mane mushroom (Hericium erinaceus) uniquely stimulates nerve growth factor (NGF) synthesis via its active compounds hericenones (fruiting body) and erinacines (mycelium). Clinical trials show cognitive improvements in adults with mild cognitive impairment. It is also studied for peripheral nerve regeneration and mood disorders.

• lithium orotateScientific

  Lithium orotate acts directly within the nervous system by inhibiting GSK-3β, upregulating neurotrophic factors, modulating multiple neurotransmitter systems, and protecting neurons against apoptosis, excitotoxicity, and protein aggregation. Human clinical data confirm gray matter preservation and biomarker changes consistent with neuroprotection.

• lobeliaScientific

  Lobeline is a well-characterized nicotinic acetylcholine receptor ligand with dose-dependent biphasic effects on the CNS. At low doses it stimulates; at higher doses it depresses the CNS. These effects are supported by pharmacological studies and underpin multiple traditional and investigated clinical uses.

• lotus seedScientific

  Lotus seed alkaloids (neferine, liensinine) exert well-documented neuroprotective, sedative, anxiolytic, anticonvulsant, antidepressant, and memory-enhancing effects in animal models through GABAergic, serotonergic, cholinergic, and NLRP3-inhibitory mechanisms. TCM uses lotus seed embryo for nervous system disorders.

• luteinScientific

  Lutein crosses the blood-brain barrier and is selectively distributed in brain regions implicated in cognition, including the hippocampus and frontal cortex, where it exerts neuroprotective antioxidant and anti-inflammatory effects. Animal and cellular studies demonstrate that lutein reduces neuroinflammation, protects retinal neurons, and modulates microglial activity. RCTs in older adults show supplementation enhances neural efficiency and modifies brain activation patterns on fMRI.

• luteolinScientific

  Luteolin exerts broad neuroprotective effects throughout the nervous system, including anti-neuroinflammatory, antioxidant, and neurotrophic-factor-inducing actions relevant to multiple neurological and psychiatric conditions. It crosses the blood-brain barrier and modulates microglial activation.

• lycheeScientific

  Lychee seed polyphenols and saponins demonstrate neuroprotective effects in rodent models of Alzheimer's disease and T2DM-associated neurodegeneration, reducing hippocampal Aβ, Tau, and AGE accumulation and preventing neuronal apoptosis. Lychee polyphenols suppress Aβ(1-42)-induced neuroinflammation in vitro. Proposed mechanisms include PKC pathway activation and improvement of insulin signaling in the brain.

• macadamiaScientific

  Macadamia nuts provide oleic acid, palmitoleic acid, and tocotrienols that support neuronal membrane integrity and may protect against neurodegenerative conditions. Tocotrienols found in macadamia have documented neuroprotective properties. Oleic acid and palmitoleic acid support nerve membrane structure and synaptic communication. Evidence is primarily preclinical with supporting epidemiological data.

• magnesiumScientific

  Magnesium is fundamental to nervous system function, acting as a physiological NMDA receptor antagonist and regulator of neuronal excitability, neuromuscular transmission, and nerve signaling. Hypomagnesemia is clinically associated with neuromuscular hyperexcitability, tremors, and seizures; magnesium deficiency is linked to neurological disorders ranging from migraine to depression. Magnesium sulfate is a standard-of-care intravenous treatment for eclamptic seizures.

• magnoliaScientific

  Magnolia bark is one of the most extensively studied herbal agents for nervous system modulation. Honokiol is a potent GABA-A positive allosteric modulator, produces anxiolytic and sleep-promoting effects via the benzodiazepine receptor site, crosses the blood-brain barrier readily, and exerts neuroprotection against beta-amyloid, neuroinflammation, and ischemic injury in preclinical models.

• maitake mushroomScientific

  Maitake polysaccharides have been investigated for effects on neurodegenerative diseases including Alzheimer's and Parkinson's in preclinical models. The mushroom's ergothioneine content—a brain-accumulating antioxidant—offers a plausible neuroprotective mechanism. A 2026 RCT linked maitake to improved cognitive scores in older adults.

• manganeseScientific

  Manganese is an obligate cofactor for glutamine synthetase in astrocytes, regulating glutamate-glutamine cycling and neurotransmitter homeostasis. MnSOD protects neuronal mitochondria from oxidative damage. Manganese also modulates dopaminergic, GABAergic, and serotonergic systems.

• mangosteenScientific

  Mangosteen xanthones exhibit neuroprotective, antioxidant, and anti-neuroinflammatory properties in preclinical models relevant to Alzheimer's disease, Parkinson's disease, and depression. A 24-week RCT in 114 schizophrenia patients examined cognitive function using standardized batteries. Brain BDNF was increased by mangosteen pericarp in animal cognition studies.

• maqui berryScientific

  Maqui delphinidins exhibit neuroprotective properties in cell models: they protect photoreceptor neurons from blue light-induced mitochondrial and lysosomal damage and ameliorate rotenone-induced neurotoxicity (a Parkinson's disease model). These findings suggest neuroprotective potential beyond the retina, though no human neurological clinical trial exists.

• marjoramScientific

  Marjoram has documented nervine, anxiolytic, and anticholinesterase activities across human RCT, traditional records, and animal studies. It is classified as a parasympathomimetic herb modulating autonomic nervous system balance.

• MCT (medium chain triglycerides)Scientific

  MCT-derived ketone bodies serve as an alternative neuronal fuel, with particular relevance in neurological conditions characterized by impaired glucose metabolism. The MCT ketogenic diet is an established neurological therapy for drug-resistant epilepsy. Decanoic acid (C10) directly modulates AMPA receptor activity, an established anticonvulsant mechanism independent of ketosis.

• melatoninScientific

  Melatonin is a neurohormone secreted by the pineal gland that regulates circadian rhythms and sleep-wake cycles. Extensive clinical evidence supports its use for jet lag, shift work, and circadian rhythm sleep disorders. NCCIH and clinical guidelines recognize melatonin's role in the nervous system regulation of sleep.

• menthol oilScientific

  Menthol exerts direct neurological effects via TRPM8 cold receptor activation, voltage-gated sodium channel blockade, and mu/kappa opioid receptor modulation. These mechanisms underlie its analgesic, antipruritic, and sensory-modulating clinical applications.

• methionine methylsulfonium chlorideScientific

  MMSC exerts neuroprotective effects in rodent models of drug-induced oxidative brain injury. In pentylenetetrazol-induced epileptogenic stress and amiodarone-induced brain injury models, MMSC normalized elevated lipid peroxidation, ROS, and nitric oxide levels and restored antioxidant capacity in brain tissue. All evidence is preclinical; no human neurological studies exist.

• methylcobalaminScientific

  MeCbl is the biologically active coenzyme form of vitamin B12 acting directly in the nervous system, promoting axonal regeneration, myelination, and neuronal survival. Multiple in vitro, animal, and clinical studies demonstrate its neuroregenerative properties, especially in peripheral neuropathies. It reduces homocysteine-mediated neurotoxicity and supports myelin synthesis.

• mintScientific

  Menthol acts on multiple nervous system targets including TRPM8 cold receptors, kappa-opioid receptors, and voltage-gated sodium channels, producing analgesia, local anesthesia, and cooling sensations. Animal studies document CNS anxiolytic effects. Human studies confirm analgesic and cognitive (attention) effects.

• molybdenumScientific

  Loss of the molybdenum cofactor produces MoCD, a rare but clinically devastating neurometabolic disorder characterized by neonatal seizures, brain atrophy, and progressive neurological deterioration. Sulfite accumulation secondary to sulfite oxidase loss is the primary neurotoxic driver. Multiple clinical case series and the recognized disease entity constitute strong scientific evidence for molybdenum's indispensable role in nervous system integrity.

• morindaScientific

  M. officinalis oligosaccharides have been studied specifically for neuroprotection in Alzheimer's disease models, antidepressant activity (clinical meta-analysis n=1,384), and antifatigue effects. Mechanisms include BDNF/TrkB/CREB pathway activation, Nrf2/ARE antioxidant protection, and gut microbiota-mediated serotonin enhancement.

• morusScientific

  Morus extracts show neuroprotective properties in preclinical models via antioxidant, anti-amyloid, and anti-neuroinflammatory mechanisms. Mulberry anthocyanins reduce amyloid-β accumulation and improve memory in aging mouse models. Gut-brain axis modulation provides an additional mechanistic pathway.

• motherwortScientific

  Motherwort is one of the most widely used sedative medicinal plants and is approved as a sedative medicine in Eastern Europe. Its iridoid and alkaloid fractions interact with GABAergic pathways to produce anxiolytic, sedative, and CNS-inhibitory effects confirmed in animal studies and supported by human pilot data showing improvements in anxiety, depression, and sleep disorders.

• myrobalanScientific

  TC extract prevents scopolamine-induced amnesia in rodents via cholinergic modulation and antioxidant protection of brain tissue. A 2025 human RCT (n=100) demonstrated improved cognitive function and BDNF levels. TC is described in Ayurveda for nervous weakness and neurological conditions.

• NAC (N-acetyl cysteine)Scientific

  NAC has extensive clinical evidence for effects on the nervous system, investigated in over 20 psychiatric clinical trials and multiple neurological conditions. Its mechanisms include glutathione replenishment, glutamate modulation, dopamine protection, and neuroinflammation reduction. Favorable evidence exists in schizophrenia, bipolar disorder, depression, OCD, progressive myoclonic epilepsy, and neurodegeneration.

• naringinScientific

  Naringin and naringenin exert broad neuroprotective effects across Alzheimer's, Parkinson's, anxiety, depression, and peripheral neuropathy models. Key mechanisms include Nrf2 activation, Aβ clearance, acetylcholinesterase inhibition, MAO-A inhibition, and neuroinflammation suppression. All clinical-relevant evidence is preclinical.

• nattokinaseScientific

  Nattokinase exerts neuroprotective effects on the nervous system through fibrinolytic activity that reduces cerebrovascular thrombus burden, anti-inflammatory modulation of neuroinflammation, and protection of the blood-brain barrier (BBB). Preclinical studies show NK reduces neuroinflammatory cytokines and ameliorates BBB dysfunction in neurodegeneration models. A clinical RCT in patients with cerebrovascular stenosis has explored NK's effects on cerebral blood flow and cognitive outcomes.

• nicotinamide ribosideScientific

  NR has undergone phase I clinical trials specifically in Parkinson's disease demonstrating it can raise cerebral NAD+ levels, alter cerebral metabolism, and improve functional outcomes. It reduces neuroinflammation and inflammatory cytokines in cerebrospinal fluid. Preclinical evidence shows NR protects against cortical neuronal degeneration, prevents neuropathy on high-fat diets, and enhances synaptic plasticity.

• NMN (β-nicotinamide mononucleotide)Scientific

  Preclinical data demonstrate NMN rescues cerebromicrovascular endothelial function, neurovascular coupling, and prevents neuroinflammation and neuronal loss via NAD+/SIRT1 mechanisms. A small human RCT raised brain NAD+ but did not show significant cognitive improvement. NMN has also been reported to improve cardiac function in neurological disease (Friedreich's ataxia).

• nut grassScientific

  C. rotundus demonstrates neuroprotective, anticonvulsant, sedative, anxiolytic, and antidepressant activities in preclinical models. It is a nervine tonic in Ayurveda and used in TCM for neurological conditions. Neuroprotection against dopaminergic neuron damage has been documented in vitro.

• oatScientific

  Oat β-glucan has been associated with reduced anxiety, fatigue, headache, and improved concentration in an RCT measuring non-GI symptoms. Traditional use of oat straw (Avena sativa herb) as a nervine tonic has historical documentation. Clinical evidence is preliminary but scientifically grounded.

• oleanolic acidScientific

  OA protects against neuroinflammation, reverses cholinergic-blockade-induced memory impairment, inhibits Alzheimer's-related amyloid-beta neuroinflammation, and supports mitochondrial function in neural tissue via TGR5 agonism. Effects are mediated through BDNF/TrkB signaling and sPLA2-IIA inhibition.

• oliveScientific

  Olive polyphenols have documented neuroprotective activity: oleocanthal clears amyloid-beta across the blood-brain barrier, oleuropein inhibits Aβ/α-synuclein aggregation, and hydroxytyrosol reduces neuroinflammation. A systematic review (2026) confirmed preclinical and limited human evidence for neuroprotection against Alzheimer's and Parkinson's. Mediterranean diet adherence is epidemiologically linked to reduced dementia risk.

• olive oilScientific

  EVOO's polyphenols are neuroprotective via inhibition of neuroinflammation, protection of the blood-brain barrier, reduction of amyloid-beta and tau pathologies, and modulation of autophagy. Human clinical evidence includes RCTs and large cohort studies linking olive oil consumption to preserved cognitive function and reduced neurodegenerative disease risk.

• omega-3 fatty acidsScientific

  DHA is a dominant structural lipid of the central nervous system, incorporated into neuronal membranes where it modulates membrane fluidity, receptor function, and signal transduction. Omega-3 deficiency is associated with multiple neurological disorders including Alzheimer's disease, depression, and ADHD. Clinical evidence supports roles in mood regulation, neuroprotection, and cognitive function.

• omega-6 fatty acidsScientific

  Arachidonic acid (AA), an omega-6 PUFA, is a major structural lipid in neuronal cell membranes throughout the CNS and PNS. Adequate omega-6 fatty acid status is associated with maintained peripheral nerve conduction, and GLA supplementation has shown benefits in diabetic neuropathy RCTs. Low plasma omega-6 levels predict accelerated decline of peripheral nerve function in longitudinal cohort studies.

• omega-9 fatty acidsScientific

  Oleic acid (omega-9) is a critical structural component of nervous system myelin and brain membrane phospholipids, and acts as a neurotrophic factor during development. Nervonic acid (24:1 n-9) is especially abundant in peripheral nerve myelin. OA demonstrates neuroprotective activity in ischemia models via PPAR-γ activation.

• onionScientific

  Onion demonstrates neuroprotective properties including protection against cerebral ischemia, diabetic neuropathy, and neurodegenerative processes. Quercetin metabolites can cross the blood-brain barrier to exert direct neuroprotective effects. Onion's outer scale extract improves memory and sensorimotor function in cerebral injury animal models.

• ophiopogonScientific

  Ophiopogon japonicus and its compounds display preclinical neuroprotective effects including anti-anxiety (via ruscogenin/TLR4-NLRP3 axis), anti-inflammatory suppression of neuroinflammation, and antioxidant protection of neuronal cells. Neuroprotective effects are listed in multiple pharmacological reviews.

• ophiopogon rootScientific

  Preclinical studies show ophiopogon root constituents have neuroprotective effects, reducing oxidative stress in neural tissue and protecting against neuronal damage. Janohigenins (anacardic acid derivatives) isolated from O. japonicus seeds show neuroprotective activity in published phytochemistry research. TCM also classifies the herb as calming the mind and nervous spirit.

• orangeScientific

  Orange essential oil compounds (limonene, linalool) modulate GABAergic nervous system activity and have demonstrated anxiolytic effects in human clinical studies. Hesperidin from orange also shows neuroprotective properties relevant to neurodegenerative conditions. Traditional use of orange for calming, stress, and sleep support the nervous system classification.

• oriental arborvitaeScientific

  P. orientalis seeds and leaves have well-documented neuroprotective and neuroactive properties recognized in systematic reviews. Preclinical studies demonstrate modulation of 5-HT, GABA, and monoamine systems; seed extracts show MAO inhibitory and triple reuptake inhibitory properties. The plant has traditionally been used for neurasthenia, insomnia, anxiety, and palpitations.

• oryzaScientific

  Oryza sativa bran contains gamma-oryzanol and beta-sitosterol, which modulate HPA axis activity, monoamine neurotransmitters, and glucocorticoid receptor signaling in animal models. Sleep-promoting neurological effects have been observed in both animal models and human participants.

• paederia foetidaScientific

  P. foetida exhibits documented sedative, anxiolytic, and anticonvulsant activities in preclinical rodent models, indicating CNS-modulating properties. The antinociceptive mechanism is partly opioid-mediated (reversible by naloxone), further confirming CNS engagement.

• palm oilScientific

  Palm oil is the richest natural source of α-tocotrienol, which exerts unique neuroprotective effects at nanomolar concentrations by suppressing glutamate neurotoxicity pathways independent of antioxidant activity. Human clinical and animal evidence supports palm TRF protection against ischemic stroke, neurodegeneration, and white matter disease.

• palmitic acidScientific

  Palmitic acid induces neuroinflammation and neuronal insulin resistance via TLR4/NF-κB pathways in human neuronal cell models. It impairs insulin signaling (Akt and Erk phosphorylation) and upregulates pro-inflammatory cytokines. Chronically elevated palmitic acid from high-fat diets is epidemiologically associated with cognitive decline and increased risk of Alzheimer's disease.

• partheniumScientific

  Feverfew's best-documented clinical application—migraine prophylaxis—operates largely through the nervous system via inhibition of neuroinflammation, modulation of serotonin signalling, suppression of CGRP (calcitonin gene-related peptide), and vasomotor regulation. Multiple RCTs and a Cochrane review establish clinical evidence for this nervous system action.

• passionflowerScientific

  Passionflower (Passiflora incarnata) has traditional use in European and American folk medicine for anxiety and insomnia. Chrysin and other flavonoids modulate GABA-A receptors to produce anxiolytic effects. An RCT found it comparable to oxazepam for generalized anxiety disorder with fewer side effects.

• peanutScientific

  Peanuts contain niacin, folate, vitamin E, and resveratrol—nutrients with established roles in neurological function and protection. Niacin from foods including peanuts was prospectively associated with slower cognitive decline. Peanut skin polyphenols protect neuronal cells against oxidative injury in cell-culture models.

• peonyScientific

  Paeoniflorin and P. lactiflora extract exert multiple documented effects on the nervous system including neuroprotection, antidepressant-like action, sedative properties, analgesic activity, and anticonvulsant effects, supported by preclinical data and some clinical evidence within TCM formula trials.

• PEP (prolyl endopeptidase)Scientific

  PREP/PEP is expressed throughout the central and peripheral nervous system and is involved in the maturation and degradation of neuropeptides including substance P, neurotensin, vasopressin, oxytocin, and thyrotropin-releasing hormone. Altered PREP activity is associated with depression, schizophrenia, and PTSD based on measurements in human serum and CSF. PREP inhibitors have been investigated as drugs targeting nervous system disorders.

• peppermintScientific

  Peppermint and menthol have well-documented effects on the peripheral and central nervous system. Menthol activates TRPM8 cold-receptor channels in peripheral nerves, producing analgesic and anesthetic effects. A 2006 PubMed review confirms animal studies demonstrate 'analgesic and anesthetic effects in the central and peripheral nervous system.' Human studies document neurological effects including pain reduction and cognitive modulation.

• perillaScientific

  Perilla extracts and rosmarinic acid demonstrate neuroprotective activity in multiple animal models, including Alzheimer's disease, vascular dementia, and traumatic brain injury models. A human RCT showed perilla seed oil improved cognitive function in Japanese seniors. BDNF signaling upregulation and hippocampal LTP enhancement are identified mechanisms.

• phellodendron amurenseScientific

  Berberine from P. amurense is classified as 'neuroprotective and neurotrophic,' enhancing neurite formation in PC12 neuronal cells by 30% via ERK1/2 activation. Phellodendri Cortex has documented neuroprotective activity in preclinical research. Berberine demonstrates anxiolytic effects in rodent models and the Relora blend (P. amurense + Magnolia) reduced stress and anxiety biomarkers in clinical trials.

• phosphatidylcholineScientific

  PC is the dominant phospholipid of neuronal cell membranes and an obligate precursor for ACh synthesis. Brain PC levels decline with aging, correlating with cholinergic system deterioration. PC supports neuronal membrane integrity, signal transduction, and neurotransmitter production throughout the central and peripheral nervous systems.

• phosphatidylserineScientific

  Phosphatidylserine (PS) is a phospholipid essential to neuronal membrane structure and function. Clinical trials demonstrate improvement in cognitive performance, memory, and reduction of age-related cognitive decline. The FDA has authorized a qualified health claim for PS and reduced risk of cognitive dysfunction in the elderly.

• phosphorusScientific

  Phosphorus-containing phospholipids constitute the structural matrix of neuronal membranes and regulate synaptic neurotransmission. Phosphate-based ATP and phosphocreatine fuel all neural signaling. Brain phosphorus metabolism is measurable in vivo and is disrupted in neurological disease.

• pine barkScientific

  Pycnogenol demonstrates neuroprotective and neuromodulatory effects in clinical and preclinical studies. RCTs confirm cognitive improvements in ADHD children and older adults. Animal studies show protection against oxidative neuronal damage, amyloid-beta toxicity, and ischemic injury. Clinical pharmacology reviews document significant influence on memory, learning, and catecholamine regulation.

• polygalaScientific

  P. tenuifolia is one of the most pharmacologically studied TCM herbs for CNS health, with documented neuroprotective, antidepressant, anxiolytic, sedative, and cognitive-enhancing effects across multiple preclinical models. Active compounds penetrate the blood-brain barrier and modulate BDNF, NGF, neurotransmitters, and neuroinflammatory pathways.

• polygala rootScientific

  Contemporary pharmacological reviews and multiple peer-reviewed studies identify the nervous system as the primary target of Polygala root's pharmacological effects, including neuroprotection, neurotransmitter modulation, neuroplasticity, and anti-neuroinflammation.

• pomegranateScientific

  Pomegranate polyphenols cross the blood-brain barrier and exert neuroprotective effects via antioxidant and anti-neuroinflammatory mechanisms. A human pilot RCT found improved memory and fMRI brain activation after 4 weeks of juice. Animal models demonstrate attenuation of Alzheimer's-related cognitive decline and improved memory and motor coordination.

• poppyScientific

  The central nervous system is the primary site of pharmacological action for poppy's opioid alkaloids. Morphine, codeine, and related compounds act on μ-, κ-, and δ-opioid receptors throughout the brain and spinal cord, producing analgesia, sedation, respiratory depression, and euphoria. This is among the most extensively studied drug-receptor system in pharmacology.

• potassiumScientific

  Potassium channels are indispensable to neuronal excitability, action potential repolarization, and sustained high-frequency firing. Potassium status directly governs nerve conduction, and dyskalemias cause well-documented neuromuscular dysfunction in clinical practice.

• pregnenoloneScientific

  Pregnenolone is synthesized de novo in the central nervous system (by glial cells and neurons) and functions as a neurosteroid, modulating GABA-A, NMDA, and other receptor systems. It promotes myelination, reduces neuroinflammation, supports neurogenesis, and exerts neuroprotective effects across multiple neurological and psychiatric conditions.

• privetScientific

  In vitro studies demonstrate that FLL extracts suppress neuroinflammation in microglia by inhibiting NF-κB, reducing pro-inflammatory cytokines relevant to neurodegenerative disease. A preclinical study showed FLL phenol glycosides reduced neuroinflammation and depressive-like behavior in mice. No human neurological trials exist.

• progesteroneScientific

  Progesterone and its metabolite allopregnanolone are neuroactive steroids that modulate GABA-A receptor function, producing anxiolytic, sedative, and antidepressant effects. Progesterone also has neuroprotective properties: high-dose progesterone significantly improved survival in clinical trials of traumatic brain injury (ProTECT trial). Progesterone receptors are expressed throughout the central and peripheral nervous systems.

• propionic acidScientific

  Propionate crosses the blood-brain barrier and influences both the central and peripheral nervous systems. In MS and peripheral inflammatory neuropathy patients, propionate has demonstrated neuroprotective and neuroregenerative effects via FFAR3 agonism and histone acetylation. It also modulates the enteric nervous system and hypothalamic appetite regulation, and influences sympathetic nervous system activity, as evidenced by norepinephrine-mediated metabolic effects in human studies.

• pumpkinScientific

  Pumpkin seeds supply tryptophan (serotonin/melatonin precursor), magnesium (NMDA receptor modulator), zinc (neuronal signalling cofactor), and omega-3 fatty acid alpha-linolenic acid. These support neurotransmitter synthesis, mood regulation, and neural membrane integrity. Tryptophan's serotonergic pathway is mechanistically well-established.

• pyrroloquinoline disodium saltScientific

  PQQ disodium salt has been extensively studied for nervous system effects: it stimulates NGF production, protects neurons from oxidative and excitotoxic damage, promotes mitochondrial biogenesis in neurons, and has demonstrated cognitive and mood benefits in human RCTs. Multiple mechanisms of neuroprotection are documented.

• quercetinScientific

  Quercetin can cross the blood-brain barrier and exerts documented neuroprotective effects in preclinical models relevant to Alzheimer's and Parkinson's disease, primarily via antioxidant, anti-inflammatory, and anti-apoptotic mechanisms. A 2025 systematic review covering 36 studies (including clinical trials) found quercetin significantly enhanced antioxidant defenses and downregulated pro-inflammatory cytokines in neurological contexts. Direct human neurological intervention trials remain limited.

• rehmanniaScientific

  Rehmannia has documented neuroprotective actions across multiple CNS conditions. The ScienceDirect overview identifies the nervous system as a primary pharmacological target. Catalpol and oligosaccharides protect against Alzheimer's, Parkinson's, spinal cord injury, and ischemia through antioxidant, anti-inflammatory, and antiapoptotic mechanisms. A systematic review confirmed catalpol's neuroprotective evidence across these conditions.

• rehmannia glutinosaScientific

  R. glutinosa has pharmacologically documented actions on the nervous system. Catalpol is neuroprotective across multiple CNS disease models (Alzheimer's, Parkinson's, ischemia, spinal cord injury). It induces GDNF in astroglia and enhances synaptic plasticity, BDNF, and PKC in hippocampal neurons.

• reishi mushroomScientific

  Reishi exerts neuroprotective, anxiolytic, and anti-neuroinflammatory effects supported by both preclinical and limited human clinical evidence. Ganoderic acid triterpenes modulate GABAergic neurotransmission and HPA axis activity. Polysaccharide-peptides upregulate BDNF and restore serotonin/norepinephrine in stressed animals. Human RCTs demonstrate reductions in perceived stress, anxiety, and insomnia.

• reloraScientific

  Relora's active constituents directly target CNS receptor systems. Honokiol and magnolol are positive allosteric modulators of GABA-A receptors (both synaptic and extra-synaptic), reducing CNS excitability. Both compounds are highly lipophilic and cross the blood-brain barrier. Phellodendron fractions bind to CNS stress receptors and the serotonin transporter. Clinical outcomes (anxiety reduction, mood improvement, relaxation) confirm CNS activity.

• resveratrolScientific

  Resveratrol improves cerebral blood flow and has demonstrated cognitive benefits in human RCTs, particularly in older adults and postmenopausal women. It activates SIRT1 and exerts antioxidant and anti-inflammatory actions in the central nervous system. The RESHAW 24-month trial showed significant improvement in cognitive performance and cerebrovascular reactivity.

• rhodiolaScientific

  Rhodiola rosea is an adaptogenic herb with traditional use in Scandinavian and Russian folk medicine for fatigue and mental performance. Clinical trials confirm significant reductions in mental fatigue and improvements in cognitive performance, with mechanisms involving monoamine modulation and HPA axis regulation. Multiple systematic reviews support its use.

• robusta coffeeScientific

  Caffeine in robusta coffee is a central nervous system stimulant acting primarily via adenosine receptor antagonism. Robusta's CGA and other polyphenols modulate neuroinflammation and oxidative stress in neural tissue. A dedicated review (2025) examined robusta coffee's neuroprotective bioactive compounds—caffeine, CGA, and polyphenols—and their modulation of oxidative stress, neuroinflammation, and protein aggregation pathways in neurodegenerative disease.

• roseScientific

  Rosa damascena has well-documented effects on the nervous system, with RCT-level evidence for reducing anxiety, depression, and stress via serotonin receptor modulation and possible GABAergic effects. Volatile rose constituents (citronellol, geraniol) exert CNS-active effects. Traditional Persian and Ayurvedic medicine explicitly use rose as a neurological and psychological tonic.

• rosemaryScientific

  Rosemary demonstrates broad nervous system activity with human clinical evidence for effects on memory, anxiety, depression, pain, and sleep. Its bioactives cross the blood-brain barrier (1,8-cineole, carnosic acid) and modulate acetylcholinesterase activity, monoaminergic neurotransmission, and neuroinflammatory pathways.

• rosmarinic acidScientific

  Rosmarinic acid interacts with the nervous system through multiple mechanisms: GABA transaminase inhibition (enhancing inhibitory tone), acetylcholinesterase inhibition (supporting cholinergic function), BDNF/TrkB pathway modulation, neuroprotection against oxidative and neuroinflammatory damage, and anticonvulsant activity in preclinical models. Human clinical evidence documents CNS effects on mood, anxiety, sleep, and cognition.

• royal jellyScientific

  RJ promotes neurogenesis, neurite outgrowth, and synaptic protein synthesis via BDNF/NGF induction. It modulates GABA, serotonin, and dopamine synthesis and reduces neuroinflammation across established preclinical models. One human combination RCT showed cognitive benefit in MCI.

• rutinScientific

  Rutin is a potent neuroprotective flavonoid that crosses the blood-brain barrier. It protects against neurodegeneration via antioxidant, anti-inflammatory, anti-apoptotic, and anti-amyloid mechanisms across models of Alzheimer's disease, Parkinson's disease, vascular dementia, and diabetic neuropathy.

• safflowerScientific

  Safflower flavonoids and SY compounds have documented neuroprotective activities including protection against cerebral ischemia-reperfusion injury, Parkinson's disease models, and spinal cord injury. SAFE (standardized safflower flavonoid extract) improved behavioral outcomes in both MPTP-induced and 6-OHDA-induced Parkinson's disease mouse models. SY protects against oxidative stress-induced neuronal injury via AMPK/NF-κB and Nrf2 pathways. A retrospective clinical study of ischemic stroke patients supports the neuroprotective role of safflower yellow pigment.

• saffronScientific

  Saffron (Crocus sativus) and its active constituents (safranal, crocin, crocetin) have been studied in multiple clinical trials for depression and anxiety. Meta-analyses confirm antidepressant efficacy comparable to SSRIs. Mechanisms involve serotonin reuptake inhibition and NMDA receptor modulation.

• safranalScientific

  Safranal is the primary volatile constituent of saffron responsible for its aroma and a key contributor to its antidepressant and anxiolytic effects. It modulates serotonin, dopamine, and GABA pathways in the CNS. Preclinical studies confirm neuroprotective and antidepressant-like effects; clinical evidence is embedded within saffron RCTs.

• sageScientific

  Sage modulates the nervous system chiefly through cholinesterase inhibition, increasing central acetylcholine availability. Multiple human RCTs show improvements in cognitive performance, mood, and anxiety attributable to enhanced cholinergic transmission. Anti-neuroinflammatory and neuroprotective effects add further mechanistic support.

• SAMe (S-adenosyl-L-methionine)Scientific

  SAMe is a naturally occurring methyl donor present in all human tissues and involved in over 100 methylation reactions, including synthesis of neurotransmitters (serotonin, dopamine, norepinephrine) and neuronal membrane phospholipids. Multiple RCTs demonstrate antidepressant effects comparable to tricyclic antidepressants. It is used clinically for depression and neurological conditions.

• schisandraScientific

  Schisandra modulates the central and sympathetic nervous systems through its lignans, which regulate neurotransmitters, reduce neuroinflammation, and protect against neurodegeneration. Its adaptogenic action involves Hsp70 upregulation and glucocorticoid receptor modulation, altering stress-related neural signaling. Multiple animal and some human studies support these effects.

• schisandrinsScientific

  Schisandrins exert well-documented neuroprotective effects across multiple models of neurodegenerative disease including Alzheimer's and Parkinson's disease, through antioxidant, anti-neuroinflammatory, and mitochondrial-protective mechanisms. The nervous system is one of the primary target systems documented in comprehensive reviews.

• sclerotiumScientific

  Poria cocos sclerotium contains triterpenoids (especially pachymic acid) with documented sedative, anxiolytic, and GABAergic activity. Pharmacological reviews confirm sedative and anti-seizure effects, and animal studies demonstrate modulation of GABA-A receptors.

• scrophularia rootScientific

  Neuroprotective activity is a well-documented preclinical pharmacological property of S. ningpoensis and S. buergeriana roots. Harpagoside from S. ningpoensis protected dopaminergic neurons in MPTP mouse models of Parkinson's disease. The root has also demonstrated anti-amnesic, anti-apoptotic, and antidepressant effects in animal studies.

• seleniumScientific

  Selenium is essential to nervous system function: selenoproteins expressed throughout the CNS serve antioxidant, anti-inflammatory, and signaling roles. The brain actively maintains high selenium content even during systemic deficiency, indicating biological priority. Clinical evidence includes case reports of selenium supplementation improving seizures in children with low GPx activity, and observational associations between selenium status and neurological disease risk.

• selenomethionineScientific

  Selenium is an essential trace element for nervous system function, with the brain receiving preferential selenium supply via selenoprotein P. Selenomethionine supports neuronal selenoprotein synthesis (GPX4, thioredoxin reductase, selenoprotein P), protecting neurons from oxidative damage. Preclinical studies demonstrate it mitigates cognitive decline, tau pathology, and Aβ accumulation in AD models. Brain selenium levels decline with age and correlate with cognitive performance.

• sesameScientific

  Sesamin has documented neuroprotective effects: scavenging H₂O₂-driven ROS, reversing BCL-2 decline, limiting caspase apoptosis in neuroblastoma cells, preserving mitochondrial Sirtuin 3, and reducing neuroinflammation via JNK/p38 signaling modulation. Sesame's omega-6 fatty acids support neural membrane integrity. Traditional Ayurvedic and Chinese medicine use sesame oil for nervous system nourishment.

• sichuan pepperScientific

  Hydroxy-α-sanshool directly modulates peripheral neuronal activity via KCNK and TRPV1/TRPA1 channels, producing analgesia and local anaesthesia. The SAGE review identifies neuroprotective properties as a recognised pharmacological activity. TCM documents extensive use for pain management.

• silymarinScientific

  Silymarin has documented neuroprotective activity in preclinical models of Parkinson's disease, Alzheimer's disease, cerebral ischemia, and cognitive impairment. Multiple systematic reviews have catalogued its CNS-relevant mechanisms (antioxidant, anti-inflammatory, anti-apoptotic, neurotrophic). Human clinical trial evidence for CNS indications is currently very limited.

• skullcapScientific

  Skullcap's primary clinical evidence base relates to nervous system modulation: GABA-A receptor binding, serotonin 5-HT7 receptor interaction, and documented anxiolytic/sedative effects in multiple human trials. S. lateriflora was listed in the US Pharmacopoeia (1860–1900) as a nerve tonic, and modern RCTs confirm mood and sleep benefits.

• smartweedScientific

  P. hydropiper has demonstrated sedative, anxiolytic, antidepressant, and neuroprotective activities in preclinical models. The plant's essential oils inhibit acetylcholinesterase and show cognitive benefits in Alzheimer's disease transgenic mouse models. Traditional use for depression, insomnia, and neurodegenerative diseases is also well-documented.

• sodiumScientific

  Sodium ions are the essential charge carrier underlying the nerve action potential. Voltage-gated sodium channels mediate the rapid depolarization phase of action potentials in all neurons, making sodium physiologically indispensable for nerve signal conduction. Sodium channel dysfunction (channelopathies) causes clinically recognized neurological disorders.

• sophoraScientific

  S. japonica flavonoids reduce cerebral infarction size and neurological deficits in animal models, acting via antioxidant and anti-inflammatory pathways. A randomized placebo-controlled trial protocol for S. japonica extract in adults with subjective memory complaints has been registered and initiated. Quercetin demonstrates neuroprotective properties against cognitive decline.

• soy isoflavonesScientific

  Soy isoflavones interact with the central nervous system via ERβ receptors widely expressed in the brain, influencing mood, vasomotor symptom regulation (hypothalamus), and cognitive function. Clinical trial evidence supports modest neuroprotective effects.

• spearmint leafScientific

  Polyphenols in spearmint, principally rosmarinic acid, inhibit acetylcholinesterase and exhibit neuroprotective effects in vitro and in animal models. Multiple human RCTs show cognitive improvements (attention, working memory) after spearmint extract supplementation, linking spearmint to central nervous system function.

• sphaeranthus indicusScientific

  S. indicus has well-documented CNS-active properties in preclinical studies: anxiolytic, neuroleptic, anticonvulsant, CNS depressant, and neuroprotective activities are all documented. Traditional Ayurvedic use covers epilepsy and mental illness.

• spinachScientific

  Spinach folate, vitamin K, lutein, and nitrate are identified as key nutrients associated with slower cognitive decline in the Rush Memory and Aging Project cohort study. Folate supports myelin synthesis and homocysteine reduction; nitrate enhances cerebral blood flow; vitamin K regulates sphingolipid metabolism in neurons.

• spirulinaScientific

  Preliminary clinical studies suggest spirulina reduces mental fatigue and may protect brain vessels from endothelial damage. Preclinical data show spirulina bioactives cross the blood-brain barrier and modulate multiple neuronal functions through antioxidant, anti-inflammatory, and neuroprotective mechanisms. Spirulina's C-phycocyanin inhibits neuroinflammation and normalizes antioxidant enzyme activity in neural tissues.

• SPMs (specialized pro-resolving mediators)Scientific

  SPMs are produced in neural tissues and act on neurons, microglia, and astrocytes to resolve neuroinflammation. NPD1 (neuroprotectin D1) is named for its specific neuroprotective functions. DHA is enriched in neural tissues, and its SPM metabolites are active in brain, spinal cord, and peripheral nerves.

• st. john's wortScientific

  St. John's Wort (Hypericum perforatum) has extensive clinical trial evidence for mild-to-moderate depression, with active constituents hyperforin and hypericin modulating serotonin, norepinephrine, dopamine, and GABA neurotransmission. Multiple meta-analyses confirm antidepressant efficacy comparable to TCAs and SSRIs for mild-to-moderate depression.

• stigmasterolScientific

  Stigmasterol protects neurons from oxidative stress, reduces neuroinflammation, inhibits acetylcholinesterase, enhances GABAergic transmission, and attenuates pain signaling in peripheral and central nervous system models. It crosses the blood-brain barrier.

• succinic acidScientific

  Succinic acid has been shown in animal models to improve motor behavior, ameliorate cognitive deficits, and rescue mitochondrial oxidative phosphorylation dysfunction in neurodegenerative disease models. In a clinical RCT (CYLINDER), a succinic acid–containing combination antioxidant preparation significantly reduced diabetic polyneuropathy symptoms. Glial cell studies show succinate rescues oxidative metabolism under mitochondrial stress.

• sulforaphaneScientific

  Sulforaphane is one of the most extensively studied dietary neuroprotective compounds, acting on CNS and PNS via Nrf2-driven antioxidant defense, neuroinflammation suppression, BDNF upregulation, and mitophagy. Human RCTs in schizophrenia, healthy older adults, and autism demonstrate CNS bioactivity.

• sumaScientific

  20-hydroxyecdysone-enriched fractions from Pfaffia roots show neuroprotective effects in murine models, reducing stress, anxiety, and depression while maintaining antioxidant defenses in the cortex, striatum, and hippocampus. Memory and learning improvements in aged rodents have also been reported.

• sunflowerScientific

  Vitamin E from sunflower is essential for neurological function; vitamin E deficiency is associated with peripheral nerve damage and neurological symptoms. Some evidence suggests vitamin E-rich diets may slow Alzheimer's disease progression. Sunflower's fatty acids also support neuronal membrane integrity.

• sweet flagScientific

  The nervous system is the primary body system associated with A. calamus in both Ayurvedic tradition and modern pharmacology. Documented activities include anticonvulsant, sedative, antidepressant, anxiolytic, neuroprotective, AChE-inhibitory, and analgesic effects, backed by extensive preclinical and some early human evidence.

• swertiaScientific

  Swertiamarin from Swertia demonstrates CNS-depressant effects and anticonvulsant activity in peer-reviewed animal studies. It reduces hippocampal neuroinflammation and delays pilocarpine-induced seizure onset. The plant is also documented for traditional use in epilepsy, melancholia, and mental disorders.

• szechuan lovageScientific

  CX acts on the nervous system through neuroprotective, analgesic, and cerebrovascular mechanisms. TMP and ligustilide both cross the blood-brain barrier and have demonstrated efficacy in ischemic brain injury, vascular dementia, migraine, and spinal cord injury models. CX is used clinically in China for ischemic stroke.

• taurineScientific

  Taurine is a sulfur-containing amino acid highly concentrated in the brain, retina, and nervous system. It acts as an inhibitory neuromodulator via GABA-A and glycine receptor activation and regulates calcium homeostasis in neurons. Clinical and preclinical evidence supports roles in neuroprotection, anxiety reduction, and sleep promotion.

• teaselScientific

  Preclinical studies have identified neuroprotective activity for Dipsacus asper extracts and asperosaponin VI. A phytochemical study of D. fullonum roots also found significant antiacetylcholinesterase activity, relevant to neurotransmitter regulation. These are laboratory findings without human clinical trial support.

• terminaliaScientific

  T. chebula has preclinical evidence for neuroprotective effects and one clinical pilot trial supporting cognitive and sleep improvements. Traditional Ayurvedic use for nervous weakness, dementia, and promotion of sensory function is well-documented. Corilagin from T. chebula improved memory impairment in animal models through antioxidant and anti-neuroinflammatory mechanisms.

• threonic acidScientific

  Threonic acid is the active ligand that delivers magnesium to neurons via glucose transporters, directly elevating intraneuronal Mg²⁺ and modulating NMDA receptor function, synaptic plasticity, and nerve cell mitochondrial membrane potential. Multiple mechanistic and clinical studies establish this nervous system relationship.

• tinospora cordifoliaScientific

  T. cordifolia exerts neuroprotective effects in hippocampal tissue via antioxidant enzyme upregulation, enhances memory and cognition in animal models, shows antidepressant and anxiolytic activity, and is classified as a Medhya Rasayana (mind-enhancing tonic) in Ayurveda.

• TMG (trimethylglycine)Scientific

  TMG supports the nervous system through methylation-dependent neurotransmitter synthesis (dopamine, serotonin, norepinephrine via SAMe), homocysteine reduction (protecting neurons from excitotoxicity and oxidative damage), and osmolyte activity that maintains neuronal cell volume under stress. Clinical data show TMG augments SAMe-based antidepressant treatment, and betaine levels correlate with better cognitive performance in aging populations.

• tocotrienolsScientific

  Clinical RCTs confirm tocotrienol-rich vitamin E improves peripheral nerve conduction velocity in diabetic peripheral neuropathy. Central neuroprotection has been demonstrated via white matter lesion attenuation in a 2-year human RCT. Both peripheral and central nervous system benefits are supported by clinical evidence.

• tongkat aliScientific

  Clinical RCTs show Tongkat Ali improves multiple mood-state parameters (tension, anger, confusion) assessed via validated neuropsychological instruments, consistent with beneficial effects on the nervous system. In-vitro research found eurycomanone stimulates dopamine release in human SH-SY5Y neuron-like cells. Animal studies showed anxiolytic effects. The cortisol-lowering effect has direct relevance to hypothalamic and limbic system regulation.

• trans-pterostilbeneScientific

  Pterostilbene crosses the blood-brain barrier, reduces neuroinflammation via NF-κB/MAPK inhibition, promotes neurogenesis and synaptic plasticity, and protects against cognitive decline in multiple rodent models. It has been investigated for relevance to Alzheimer's and Parkinson's disease.

• tributyrinScientific

  Tributyrin influences the nervous system via the gut-brain axis, hepatoportal butyrate-sensing neurons, and epigenetic regulation of neuronal gene expression. Animal studies demonstrate that tributyrin suppresses neuroinflammation, modulates orexin neuron activity (wakefulness regulation), and prevents neurodegenerative neuropathology in Alzheimer's mouse models.

• turmericScientific

  Curcumin demonstrates neuroprotective effects across multiple nervous system domains, supported by RCTs showing cognitive improvement, meta-analyses confirming antidepressant/anxiolytic efficacy, and preclinical data on neuroinflammation, BDNF, and amyloid pathology. It crosses the blood-brain barrier in bioavailability-enhanced forms and modulates key neurological pathways.

• tylophoraScientific

  T. indica extracts have demonstrated anti-neuroinflammatory effects in published in vitro research (PLOS ONE, 2020), suppressing LPS-induced microglial activation via NFκB and AP1 pathways. Additionally, anticonvulsant activity has been documented in validated rodent seizure models through sodium channel and T-type calcium channel mechanisms, relevant to neurological health.

• ubiquinolScientific

  Neurons are among the most metabolically demanding cells and are highly vulnerable to oxidative stress and mitochondrial dysfunction. Ubiquinol supports nervous system function via mitochondrial ATP production in neurons, antioxidant protection of neuronal membranes, and anti-inflammatory actions. Clinical evidence exists for migraine prevention and chronic fatigue/ME/CFS neurocognitive symptoms; cognitive aging RCTs are ongoing.

• urolithin aScientific

  UA's nervous system relevance is supported by its BBB permeability, neuronal mitophagy activation, suppression of neuroinflammation, and Nrf2-mediated antioxidant protection. Preclinical evidence spans Alzheimer's, Parkinson's, and stroke models. A 2025 PMC review comprehensively documents UA's CNS therapeutic potential.

• valerenic acidScientific

  Valerenic acid is the primary sesquiterpene carboxylic acid of valerian root and its principal bioactive neuromodulatory constituent. It inhibits GABA-T (reducing GABA catabolism) and positively modulates GABA-A receptors, producing sedative and anxiolytic effects. It is used as the standardization marker for valerian root extracts.

• valerian rootScientific

  Valerian root (Valeriana officinalis) has traditional use in European medicine for centuries for insomnia and nervous restlessness, recognized in the German Commission E monograph. Clinical evidence shows modulation of GABA transmission and modest benefits for sleep quality and anxiety, though results are inconsistent across trials.

• vanillaScientific

  Vanillin has been shown in multiple preclinical studies to protect dopaminergic neurons, reduce neuroinflammation via NF-κB/MAPK suppression, cross the blood-brain barrier, and elevate brain monoamine neurotransmitters. Animal models of Parkinson's disease and ischemic stroke support neuroprotective effects. Human neurological evidence is absent.

• velvet beanScientific

  MP's primary pharmacological action is on the nervous system: L-DOPA is converted to dopamine, restoring nigrostriatal dopaminergic neurotransmission in Parkinson's disease. Clinical trials in PD patients confirm motor symptom improvement. MP additionally demonstrates neuroprotection, GABAergic activity, and modulation of serotonergic, adrenergic, and dopaminergic tone confirmed in human studies.

• vinpocetineScientific

  Vinpocetine is a semi-synthetic alkaloid derived from vincamine (from Vinca minor, periwinkle). It inhibits phosphodiesterase type 1 (PDE1), dilates cerebral blood vessels, improves cerebral glucose metabolism, and has anti-inflammatory and neuroprotective effects. Multiple clinical trials support its use for cognitive decline and cerebrovascular insufficiency.

• vitamin B1Scientific

  Vitamin B1 (thiamine) is essential for neurological function as the cofactor for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase in neuronal energy metabolism. Deficiency causes beriberi (peripheral neuropathy) and Wernicke-Korsakoff syndrome. Supplementation prevents and reverses these well-characterized nervous system disorders.

• vitamin B12Scientific

  Vitamin B12 (cobalamin) is essential for the maintenance of myelin sheaths, neurotransmitter synthesis, and homocysteine metabolism in the nervous system. Deficiency causes peripheral neuropathy, subacute combined degeneration of the spinal cord, and cognitive impairment. Supplementation reverses deficiency-related neurological symptoms and is recommended by multiple health authorities.

• vitamin B2Scientific

  Riboflavin is essential for neuronal energy metabolism via FAD-dependent mitochondrial electron transport. Deficiency causes neuromuscular symptoms. Riboflavin transporter deficiency causes severe progressive neuropathy fully responsive to high-dose riboflavin. A 2025 systematic review identifies riboflavin as a multifaceted therapeutic agent in neurology.

• vitamin B3 (niacin)Scientific

  Niacin (vitamin B3) is essential for NAD+ and NADP+ synthesis, which are critical for neuronal energy metabolism and DNA repair. Deficiency causes pellagra, characterized by the neurological triad of dementia, dermatitis, and diarrhea. Pharmacological doses of niacin have been studied for schizophrenia and neuroprotection.

• vitamin B3 (niacinamide)Scientific

  Niacinamide (nicotinamide, a form of vitamin B3) supports nervous system function as a precursor to NAD+, which is essential for neuronal energy metabolism, DNA repair via PARP, and sirtuin-mediated neuroprotection. Deficiency causes pellagra with prominent neurological manifestations. Emerging evidence supports niacinamide for cognitive and neuroprotective applications.

• vitamin B5Scientific

  Vitamin B5 (pantothenic acid) is a component of Coenzyme A (CoA), which is essential for acetyl-CoA production and thus for acetylcholine synthesis in cholinergic neurons. Deficiency causes peripheral neuropathy (burning feet syndrome). It is an essential nutrient for nervous system function.

• vitamin B6Scientific

  Vitamin B6 (pyridoxine/pyridoxal-5-phosphate) is a cofactor for over 100 enzymatic reactions, including synthesis of serotonin, dopamine, norepinephrine, GABA, and sphingosine in the nervous system. Deficiency causes peripheral neuropathy and seizures. Adequate B6 is required for normal neurotransmitter balance and myelin maintenance.

• vitamin B9 (folate)Scientific

  Folate (vitamin B9) is essential for one-carbon metabolism supporting neurotransmitter synthesis, DNA methylation, and homocysteine clearance in the nervous system. Deficiency is associated with elevated homocysteine (neurotoxic), depression, cognitive decline, and neural tube defects. Clinical evidence supports supplementation for depression, cognitive function, and neuroprotection.

• vitamin B9 (methylfolate/5-MTHF)Scientific

  Methylfolate (5-MTHF, L-methylfolate) is the biologically active form of folate that crosses the blood-brain barrier to directly support monoamine neurotransmitter synthesis and homocysteine metabolism in neurons. It is particularly important for individuals with MTHFR polymorphisms who cannot efficiently convert dietary folate. Used clinically as an adjunct antidepressant (Deplin).

• vitamin CScientific

  Vitamin C is found in the highest concentrations in the brain and neuroendocrine tissues, where it supports neuronal maturation, catecholamine synthesis, and antioxidant protection. Deficiency is associated with neurodegenerative conditions, and preclinical evidence strongly supports neuroprotective effects; clinical evidence in humans remains preliminary.

• vitamin EScientific

  Vitamin E is essential for normal nervous system function; severe deficiency causes a progressive neurological syndrome including peripheral neuropathy, ataxia, and sensory loss (as in ataxia with vitamin E deficiency, AVED). Clinical evidence also supports neuroprotective roles in age-related cognitive decline, and vitamin E supplementation has been studied in Alzheimer's disease RCTs.

• wasabiScientific

  Wasabi/6-MSITC activates Nrf2-mediated neuroprotective pathways, reduces neuroinflammation, protects dopaminergic neurons in Parkinson's models, and improved memory in a human RCT. Gene expression profiling in neurons confirms oxidative stress response modulation as the primary molecular mechanism. These findings span in vitro, animal, and human levels of evidence.

• waterhyssopScientific

  Bacopa monnieri's primary pharmacological target is the nervous system. Multiple RCTs confirm clinical benefits for cognitive and neurological function, and mechanistic research establishes effects on neuronal growth, neurotransmission, acetylcholinesterase inhibition, and neuroprotection.

• wheat germScientific

  Wheat germ provides thiamine (B1), folate, B6, magnesium, and vitamin E—nutrients with well-documented roles in myelin formation, neurotransmitter synthesis, neuronal energy metabolism, and neural protection. A clinical RCT in T2DM patients found wheat germ significantly increased BDNF levels and improved mental health scores.

• willowScientific

  Willow bark's salicylate metabolites inhibit peripheral prostaglandin synthesis, reducing sensitization of peripheral nociceptors—a direct interaction with the peripheral nervous system's pain signaling. Its antipyretic action operates via suppression of hypothalamic PGE2, involving central nervous system temperature regulation. The NF-κB and TNF-α inhibition in inflammatory cells also reduces neuroinflammatory signaling. These are established mechanisms of clinically demonstrated analgesic and antipyretic effects.

• wintergreenScientific

  Methyl salicylate acts on the nervous system as a counterirritant, stimulating cutaneous sensory (TRPA1/TRPV1) nerve endings to modulate pain perception in deeper tissues. It is FDA-labeled for nerve pain relief. Traditional herbalists used wintergreen for neuralgia and sciatica. No CNS-targeted clinical trials for wintergreen exist.

• withanolidesScientific

  Withanolides are the primary steroidal lactone bioactives of Ashwagandha (Withania somnifera) responsible for its adaptogenic, anxiolytic, and neuroprotective effects. They modulate GABA-A receptors, reduce cortisol, and promote neurogenesis. Clinical evidence for their cognitive and stress-related benefits in humans mirrors the Ashwagandha RCT data.

• yarrowScientific

  Animal studies demonstrate yarrow's anxiolytic activity via GABA-A/benzodiazepine receptor modulation. Limonene in the essential oil has documented neuroprotective effects reducing neuronal ROS. Traditional use as a mild sedative and calming herb is documented in multiple folk medical systems.

• yeastScientific

  Yeast is one of the richest dietary sources of B-complex vitamins essential for nervous system function, including thiamine (B1, critical for nerve glucose metabolism), pyridoxine (B6, required for neurotransmitter synthesis), and folate (B9, essential for neurological methylation). Deficiency in each of these vitamins causes defined neurological disorders. Fortified yeast also provides B12.

• yerba mateScientific

  Caffeine and theobromine in yerba mate act as adenosine receptor antagonists to stimulate CNS arousal, focus, and mood. Preclinical evidence shows YM polyphenols reduce AChE activity and amyloid-beta expression, suggesting neuroprotective potential. Human CNS evidence beyond stimulant effects is currently preliminary.

• yohimbeScientific

  Yohimbine has well-documented, direct actions on the central and peripheral nervous systems. It is a selective α2-adrenergic receptor antagonist that increases central sympathetic outflow and peripheral norepinephrine. It also interacts with serotonin and dopamine receptors. Clinical effects include stimulation, increased alertness, potential anxiety induction, and explored uses as an adjunct to psychotherapy for anxiety disorders.

• zanthoxylumScientific

  Zanthoxylum influences the nervous system primarily through documented local anesthetic/neuromodulatory effects of sanshool compounds (TRPV1/TRPA1 activation), analgesic activity via central and peripheral ERK/NF-κB signaling, and traditional use for brain diseases. Z. bungeanum flavonoids show neuroprotective potential via TLR4/NF-κB inhibition.

• zincScientific

  Zinc is one of the most abundant metal ions in the central nervous system and is essential for normal brain function across the lifespan. It modulates synaptic activity, neuronal plasticity, and gene expression, and zinc deficiency is associated with cognitive decline, depression, and increased neurodegeneration risk. Dysregulated zinc homeostasis is implicated in Alzheimer's disease, stroke, epilepsy, and traumatic brain injury.

• borageTraditional

  Borage has a documented traditional role as a nervine and mood elevator, used for melancholy, depression, and nervous exhaustion since classical antiquity. Modern Western herbalism credits borage with adrenal cortex restoration that supports nervous system resilience. No clinical RCTs confirm central nervous system effects.

• cajuputTraditional

  Cajuput oil is documented in traditional and Ayurvedic medicine for neuralgia and has been described as a mild sedative and as having relaxing properties when inhaled. The 1,8-cineole component interacts with peripheral TRPM8 nerve receptors during inhalation. No clinical neurological studies on cajuput exist.

• cardamomTraditional

  Cardamom has traditional use in Ayurvedic medicine for nervous system conditions including anxiety, stress, and general nervous debility. Its aromatic volatile oils have soothing properties in aromatherapy contexts. Pharmacological studies have noted sedative activity. Human clinical trial data for neurological or psychological endpoints are very limited.

• clematisTraditional

  Clematis is recorded in folk medicine across multiple traditions for nervous disorders. Antinociceptive effects are demonstrated in animal models, and SKI306X (C. mandshurica) showed antiallodynic effects in mouse neuropathic pain models. Traditional use for headaches, nerve pain, and muscle spasms indicates historical nervous system applications.

• eleutheroTraditional

  Eleuthero (Eleutherococcus senticosus), also called Siberian ginseng, has been used in traditional Chinese and Russian medicine as an adaptogen to combat mental fatigue and support the nervous system under stress. Clinical evidence for nervous system effects is limited but suggests modest benefits for fatigue and cognitive performance under stress.

• gentian rootTraditional

  Traditional use sources document nervous system effects of gentian root: low doses are said to stimulate the nervous system (including the vagus nerve reflex mediating digestive secretion), while high doses are reportedly sedating. RxList and Drugs.com list 'hysteria' and muscle spasm prevention among traditional uses. In vitro and animal data for gentiopicroside show neuroprotective effects including reduction of amyloid-β in Alzheimer's models. No human neurological RCT exists.

• gentiana macrophyllaTraditional

  In TCM, Gentiana macrophylla is the central herb of Da Qin Jiao Tang, the classical formula for stroke-related hemiplegia, facial nerve paralysis (Bell's palsy), and sinew/nerve channel disorders. Its use for these neurological presentations is documented since ancient texts. Gentiopicroside also shows neuroprotective properties in broader research.

• gooseberryTraditional

  Amla is classified as a 'medhya rasayana' (neural rejuvenator) in Ayurveda. Preclinical research confirms neuroprotective activity via antioxidant protection of neuronal cells. Human RCT evidence for neurological outcomes is absent.

• gotu kolaTraditional

  Gotu Kola (Centella asiatica) has traditional use in Ayurvedic and Chinese medicine as a brain and nervous system tonic (Medhya herb). Clinical trials show modest improvements in cognition and anxiety. Triterpenoids (asiaticoside, madecassoside) support neuroprotection and neurite outgrowth.

• guggulTraditional

  In Ayurveda, guggul is described as a nervous tonic with Vatahara (Vata-pacifying) properties, making it applicable to pain conditions with neurological components such as sciatica, paralysis, and Vata-origin disorders. Modern studies have identified some neuroprotective potential in animal stroke models.

• haliotisTraditional

  Abalone shell's TCM actions of calming Shen (spirit/mind), subduing Liver Yang, and treating headache, dizziness, tinnitus, insomnia, and tremors relate to the nervous system. TCM texts describe it as having properties that influence the sympathetic nervous system.

• hawthornTraditional

  Hawthorn has documented traditional use as a mild neurosedative in European and folk medicine. Preclinical studies confirm CNS depressant and analgesic activity in mice, including effects mediated by the endogenous opioid system. The EMA recognizes its traditional indication for nervous cardiac complaints. No standalone human RCTs characterizing direct effects on nervous system function exist.

• hyssopTraditional

  Hyssop is classified as a nervine tonic and mild sedative in classical Western herbalism, with documented traditional use for anxiety, hysteria, and nervous exhaustion. Animal pharmacology suggests CNS-modulating activity. Traditional sources including Annie's Remedy, Herbal Reality, and Turkish and Iranian folk medicine document its use for nervous system disorders.

• indigo leavesTraditional

  Indigo (I. tinctoria) has a long traditional use for nervous system disorders including epilepsy, convulsions, and neurological complaints in Ayurveda, Siddha, and TCM. Animal studies demonstrate anticonvulsant activity via GABA modulation. The Ayurvedic Pharmacopoeia of India specifically recommends it for 'phobia, delusion and disturbed mental state.'

• inositol nicotinateTraditional

  Inositol is an established component of phosphatidylinositol second-messenger signaling in neurons, and the broader inositol family has documented evidence in neurological and psychiatric conditions. IHN specifically is traditionally listed across clinical sources for insomnia, restless leg syndrome, and migraine. These uses lack direct IHN-specific RCT support and rely on inositol's neurological roles and niacin's NAD+ precursor function.

• lemongrassTraditional

  Lemongrass is documented in Ayurvedic and Asian folk medicine for its effects on the central nervous system, including sedative, anxiolytic, antidepressant, and analgesic properties. Human aromatherapy studies confirm anxiety reduction. Animal studies confirm neuroprotective and antidepressant-like effects of C. citratus extracts.

• licorice rootTraditional

  Licorice root has traditional use in Chinese and Ayurvedic medicine for calming and nervine effects. Animal studies show licorice enhanced memory and reversed scopolamine-induced amnesia via possible cholinergic facilitation. Isoflavones from licorice may inhibit serotonin reuptake. Clinical human neurological evidence remains limited.

• macaTraditional

  Maca (Lepidium meyenii) is a Peruvian root vegetable used traditionally for energy, mood, and sexual function. Modern clinical trials show benefits for sexual dysfunction and menopausal mood symptoms. Macamides and macaenes are proposed to modulate the endocannabinoid system and dopamine pathways in the nervous system.

• mimulusTraditional

  Mimulus is traditionally associated with supporting a sensitive, easily overstimulated nervous system through the Bach flower remedy framework. Practitioners describe the 'Mimulus type' as someone with a hypersensitive nervous system that needs protection from excessive stimuli. Some traditions also used Mimulus species as mild sedative teas. No clinical evidence supports a direct nervous system action.

• mugwortTraditional

  A. vulgaris is documented in the European Pharmacopoeia and multiple ethnomedicinal systems for nervous system disorders including epilepsy, anxiety, insomnia, depression, and stress. Phenolic constituents inhibit MAO in rodent brain preparations, and Artemisia-genus constituents modulate GABA-A receptors — providing mechanistic support. No human RCTs on nervous system outcomes exist for oral mugwort.

• muira puamaTraditional

  Muira puama is one of the most well-documented traditional nerve tonics in South American and European herbal medicine, used across centuries for neurasthenia, paralysis, ataxia, tremors, and nervous weakness. It appears in the British Herbal Pharmacopoeia and German herbal medicine as a CNS tonic. Preclinical data on neuroprotection and AChE inhibition provide growing scientific plausibility.

• mulleinTraditional

  Mullein flowers and roots carry a traditional reputation as nervines—soothing inflamed nerves, relieving neuralgic pain, and reducing stress and anxiety. This use is documented in multiple traditional materia medica and herbal texts. The antispasmodic mechanism provides partial mechanistic support, but no clinical trials address nervous system endpoints.

• peachTraditional

  Peach leaf is classified as a relaxing sedative nervine in Western herbalism, used for anxiety, nervous restlessness, and burnout. Peach gum and flowers also possess sedative properties. This is documented across Eclectic, Appalachian folk, and other traditional systems.

• prickly ashTraditional

  Prickly ash is classified as a nerve tonic in Eclectic and naturopathic herbalism traditions. PeaceHealth records its use 'to strengthen the nervous system.' The sanshool-TRPV1/TRPA1 mechanism provides preclinical neurochemical support. Traditional use for neuralgia, nerve pain, and peripheral neuropathy is consistently documented.

• purslaneTraditional

  A systematic pharmacological review (PMC, 2023) comprehensively documents purslane's neuroprotective, neuroregenerative, antinociceptive, antidepressant, and anxiolytic properties in preclinical models. Melatonin, omega-3 ALA, and specific alkaloids are key active constituents. Human clinical trials specifically targeting nervous system disorders are lacking.

• salicinTraditional

  Salicin's analgesic action via salicylic acid modulates nociceptive signalling in the peripheral nervous system through prostaglandin suppression. Traditional use for headache, fever, and nerve-related pain extends this to neurological symptom relief. No direct neuropharmacological RCTs with salicin as the agent have been conducted.

• siler rootTraditional

  SD's dried root is listed in the Chinese Journal of Integrative Medicine review as used for nervous system diseases, and TCM texts describe its use for convulsions, tremors, and tetanus—framed as 'internal wind' conditions. A chromone glycoside from SD showed neuroprotective effects in a focal cerebral ischemia rat model via PI3K/Akt signaling. Evidence is sparse and preclinical.

• soursopTraditional

  Soursop leaves, bark, and roots have documented traditional uses as nervine, sedative, anticonvulsant, and antispasmodic agents across multiple cultures. Alkaloids with potential CNS activity are the primary proposed bioactive agents.

• squawvineTraditional

  Squawvine is classified in Eclectic and naturopathic herbalism as a nervous tonic and restorative, with documented sedative properties referenced in pharmacobotanical sources. The Menominee used it for insomnia. No neurological clinical studies exist.

• star of bethlehemTraditional

  Star of Bethlehem is traditionally associated with the nervous system through two pathways: the Bach flower remedy tradition, which assigns it to nervous shock, trauma, and acute nervous tension; and the homeopathic tradition, which describes 'complete prostration' and nervous exhaustion accompanying its gastric picture. Both are traditional, without clinical neurological or neuropharmacological evidence.

• white willowTraditional

  White willow bark's analgesic effects operate partly through the nervous system via inhibition of peripheral prostaglandin synthesis and pain signal modulation in sensory nerves. German Commission E approves it for headaches, and its longest-standing traditional applications include neuralgic and head pain. Direct neuropharmacological RCTs are absent.