alpinia galangal

Alpinia galanga (Greater Galangal): A Comprehensive Reference

1. Identity and Botanical Classification

Nomenclature

Alpinia galanga (L.) Sw. belongs to the family Zingiberaceae and is known commonly as galangal, greater galangal, or Siamese ginger. The plant's accepted binomial authorship is Alpinia galanga (L.) Willd., and it carries several synonyms in older literature, including Languas galanga and Maranta galanga. Regional vernacular names include romdeng (រំដេង) in Cambodia, kha (ข่า) in Thailand, nankyō (ナンキョウ, 南姜) in Japan, and hóng dòu kòu (紅豆寇) in Mandarin Chinese. In Tamil it is known as Pae-reeya-ra-thai and is widely used in Siddha medicine and in culinary practice. It should not be confused with lesser galangal (Alpinia officinarum), which is also used but less frequently.

Botanical Description

Alpinia galanga, commonly known as galangal or greater galangal, is a perennial rhizomatous herb in the ginger family (Zingiberaceae), prized for its pungent, aromatic rhizomes, native to Southeast Asia, particularly Indonesia and Thailand, and has been cultivated for centuries both as a spice and as a medicinal plant. The plant grows from rhizomes in clumps of stiff stalks up to 2 metres (6 ft 7 in) in height with abundant long leaves that bear red fruit, and it is an evergreen perennial. The rhizomes are knobbly, reddish-brown to cream in color, with a firm texture and a sharper, more pine-like flavor than common ginger (Zingiber officinale). In summer and autumn, it produces striking white flowers with red streaks on the lip, followed occasionally by small red berries, though the rhizomes remain the primary economic product.

Geographic Distribution and Cultivation

Lengkuas (A. galanga) is native to South and Southeast Asia. Its original center of cultivation during the spice trade was Java, and today it is still cultivated extensively in Island Southeast Asia, most notably in the Greater Sunda Islands and the Philippines. Its cultivation has also spread into Mainland Southeast Asia, most notably Thailand. It is a common ingredient in Indonesian, Khmer, Lao, Malaysian, Thai and Vietnamese cuisine, and is also used in some traditional Chinese medicine.

Common Forms and Preparations

The rhizome is the primary part of the plant used in both culinary and medicinal contexts. Alpinia galanga is available in several forms: fresh rhizomes, dried slices, or powdered. Fresh galangal, identifiable by its firm texture and smooth, reddish-brown skin, offers the most potent flavor and aroma. In scientific research and the dietary supplement trade, standardized extracts of the rhizome — most notably under the proprietary name EnXtra® — are used in capsule form. Alpinia galanga is also widely cultivated for its essential oil, which has been used in cosmetics and perfumes.

2. Traditional and Historical Use

Ayurvedic Medicine (India)

It is a very important medicinal plant used widely in traditional medicines of many countries, especially in the Ayurvedic system of medicine that is prevalent in India. Ayurveda considers A. galanga (Sanskrit: rasna) as a Vata Shamana drug — i.e., a substance that calms Vata-related disorders. The rhizomes have been used in Ayurvedic medicine and are ingredients in many traditional medicines to treat various ailments such as stomach disorders and skin diseases. In India, rhizomes have many applications in traditional medicines such as for skin diseases, indigestion, colic, dysentery, enlarged spleen, respiratory diseases, mouth, and stomach cancer. Alpinia galanga rhizomes have been traditionally used to treat bronchial problems in tropical areas of south and east India.

Traditional Chinese Medicine and Southeast Asian Systems

Due to their spicy flavor and aromatic odors, both rhizomes (A. galanga and A. officinarum) have long been used as flavoring ingredients and spices in Asia. They also were well-known traditional Chinese medicines and have been widely used as a remedy for gastrointestinal diseases, such as stomachache and dyspepsia. Alpinia galanga has been used in traditional medicine, especially in Thai, Ayurveda, Unani, and Chinese folk medicine. It is used as an essential spice and food-flavoring product as well as medicine among Asian folks. It has been used against rheumatism, treatment of respiratory diseases, bronchial catarrh, bad breath and ulcers, whooping colds in children, throat infections, and fever.

The rhizome has been reported to be useful as a carminative and as a treatment for rheumatoid arthritis, inflammation, stomatopathy, pharyngopathy, cough, asthma, hiccough, dyspepsia, stomachalgia, obesity, diabetes, cephalalgia, tubercular glands, and intermittent fevers.

Siddha Medicine

Known as perarathai in Tamil, this form of ginger is used with licorice root (Glycyrrhiza glabra, called athi-mathuram in Tamil) as folk medicine for colds and sore throats.

Medieval European Use

The galangal rhizomes were widely used in ancient and medieval Europe, where they were reputed to smell of roses and taste of sweet spice. Its use in Europe has dramatically declined. In medieval Europe, it was celebrated in herbal texts by Hildegard of Bingen and others as a tonic for vitality.

Preparation Methods in Traditional Practice

Traditional remedies for digestive comfort and nausea often involved preparing decoctions or infusions from the rhizome. For a clear and strong voice, the rhizome was chewed along with betel, and was also used for bathing feverish people. Rhizome oil is used for nourishing hair and as massage oil, and the fragrant essential oil of the rhizome is used as a cosmetic.

3. Phytochemistry: Key Constituents and Active Compounds

Overall Profile

The phytochemical profile of Alpinia galanga is diverse, encompassing both primary and secondary metabolites that contribute to its pharmacological significance. The plant is particularly rich in flavonoids, terpenoids, phenolic compounds, and essential oils, many of which serve as chemical markers for quality control and therapeutic evaluation.

Phenylpropanoids — Primary Bioactive Class

Several active compounds, including 1'S-1'-acetoxychavicol acetate, 1'S-1'-acetoxyeuginol acetate, 1,8-cineol, α-fenchyl acetate, β-farnesene, β-bisabolene, α-bergamotene, β-pinene, β-sitosteroldiglucoside (AG-7), β-sitsteryl arabinoside (AG-8), 1'-acetoxychavicol acetate (galangal acetate), and p-hydroxycinnamaldehyde have been extracted from the plant. Among these, 1'-acetoxychavicol acetate (ACA) is widely regarded as the most pharmacologically significant compound. ACA has been found to suppress chemical- and virus-induced tumor initiation and promotion.

From Alpinia galanga, six phenylpropanoids were obtained and their structures were identified as (S)-1'-ethoxy chavicol acetate, (E)-4-acetoxy cinnamyl ethyl ether, (E)-4-hydroxycinnamaldehyde, (E)-4-acetoxy cinnamyl alcohol, 4-acetoxy cinnamyl acetate, and 4,4'[(2E,2'E)-bis(prop-2-ene)-1,1'-oxy]-diphenyl-7,7'-diacetate.

Flavonoids

Among its major bioactive constituents, galangin, kaempferol, alpinin, and 1′-acetoxychavicol acetate have been widely reported for their antioxidant, antimicrobial, and anti-inflammatory properties, while zerumbone represents another notable metabolite with chemopreventive potential. The rhizome of Alpinia galanga contains the flavonol galangin. The main flavonoid constituents of Alpinia galanga are reported as kaempferol, kaempferide, and volatile components including trans-p-coumaryl diacetate, di-(p-hydroxy-cis-styryl)methane, eugenol acetate, 1'-hydroxychavicol acetate, and p-hydroxycinnamaldehyde.

Essential Oil Constituents

The primary active ingredients of A. galanga include 1,8-cineol, fenchyl acetate, farnesene, bisabolene, bergamotene, pinene, and 1'-acetoxychavicol acetate. One of the distinguishing compounds of Alpinia spp. is 1,8-cineole, which has been noted as the most prevalent chemical in the majority of investigations on A. galanga. GC-FID/MS analysis of the flower essential oil identified farnesene (64.3%) as the most abundant component, followed by farnesyl acetate (3.6%), aceteugenol (3.2%), eugenol (3.1%), E-nerolidol (2.9%), decyl acetate (2.4%), octyl acetate (2.0%), sesquirosefuran (1.9%), (E)-β-farnesene (1.7%), and germacrene D (1.5%).

Other Notable Compounds

Phytochemical investigations have shown that galanga species have similar chemical constituents, such as diarylheptanoids, flavonoids, volatile oil, terpenes, phenylpropanoids, and glycosides, but the main chemical components differ between species. Ethyl trans-cinnamate and ethyl 4-methoxy-trans-cinnamate from galanga root oil induced the activity of the detoxifying enzyme glutathione S-transferase (GST), a major mechanism for chemical carcinogen detoxification.

4. Mechanisms of Action

Anti-Inflammatory Pathways

Galangin works at multiple target sites such as nitric oxide synthase (NOS), COX-1 and COX-2, androgen receptor, peroxisome proliferator-activated receptor, dipeptidyl peptidase-IV, and serine/threonine-protein kinase, and suppresses extracellular signal-regulated kinase (ERK) and NF-κB-p65 phosphorylation, which leads to anti-inflammatory activity.

In preclinical neuroinflammation models, galangin significantly inhibits the production of TNF-α, IL-6, IL-1β, COX-2, and iNOS in LPS-induced BV-2 cells. The mechanistic studies found that galangin suppresses the activation of microglial cells via associating with phosphorylation of the AKT, NF-κB p65, JNK, and p-38 signaling pathways.

An in vitro study on the anti-psoriatic effect of the A. galanga ethanol extract in HaCaT keratinocyte cells indicated that the extract could modulate NF-κB signaling biomarker expression. According to semi-quantitative RT-PCR analysis, the extract significantly enhanced TNF-α induced protein 3 expression and markedly inhibited the expression of mRNA of CD-40, NF-κB2, and CSF-1.

Galangin exerts its anti-inflammatory and pain effects by inhibiting TRPV1 activation and regulating COX-2, NF-κB/TNF-α expression, providing mechanistic evidence for the use of galangin in the management of inflammatory pain.

Antioxidant Activity

Aqueous rhizome extracts demonstrated strong free radical scavenging abilities in DPPH and nitric oxide assays, outperforming related species such as Alpinia calcarata. These in vitro results point toward the plant's potential in mitigating oxidative stress. Alpinia galanga has been shown to exhibit considerable superoxide anion scavenging, metal chelating, and strong free radical scavenging action against DPPH radicals in both its aqueous and methanolic extracts.

Both ACA and galangin found in Alpinia sp. protect human dermal fibroblasts from senescence by inhibiting NF-κB activation, decreasing the expression of inflammatory factors, and upregulating IGF1R/Akt-related proteins. These actions indicate that galangin may be a potential candidate for developing natural anti-ageing products that protect the skin from damage caused by reactive oxygen species (ROS).

Antimicrobial Mechanisms

Several chemical compounds in Alpinia galanga rhizomes, such as 1,8-cineole and methyl eugenol, have been reported to have antibacterial and antifungal activity. 1′-acetoxychavicol acetate has been shown to significantly affect bacterial membrane integrity and inhibited protein expressions associated with cell wall and membrane synthesis and osmotic regulation.

Anticancer Mechanisms

Biological properties of A. galanga and its constituents include anticarcinogenic effects, chemoprevention through COX-2 suppression, antioxidative actions, and inhibition of TNF-α and IL-4. Induction of apoptosis in human myeloid leukemic cells by 1-acetoxychavicol acetate has been demonstrated through a mitochondrial- and Fas-mediated dual mechanism (Ito et al., Clinical Cancer Research 2004).

Antidiabetic Mechanisms

Phenylpropanoids from A. galanga increase glucose-stimulated insulin secretion (GSIS) effect without cytotoxicity in rat INS-1 pancreatic β-cells. Treatment with a specific phenylpropanoid, acetoxyeugenol acetate (AEA), showed an increase in expressions of IRS-2, PI3K, Akt, and PDX-1 in INS-1 cells. Additionally, AEA exhibited α-glucosidase inhibitory activity, consistent with a potential antidiabetic mechanism.

5. Scientific Evidence by Area of Use

5.1 Cognitive Function and Mental Alertness

This is among the most extensively clinically studied applications of A. galanga extract (AGE), primarily using the proprietary standardized extract EnXtra®.

• Randomized placebo-controlled study (2017) — Journal of the American College of Nutrition: A randomized, double-dummy, double-blind, placebo-controlled cross-over study was conducted to determine the effect of A. galanga on mental alertness and sustained attention in comparison with caffeine and placebo in participants with a habitual caffeine intake. Fifty-nine participants aged 18–40 years with moderate caffeine consumption were enrolled.
• Randomized placebo-controlled clinical trial (2020) — Journal of the American College of Nutrition: In a double-blind, randomized, placebo-controlled, parallel-group study, 69 participants were assigned to receive either 300 mg EnXtra with 200 mg of caffeine, 300 mg of EnXtra alone, or placebo twice per day for 12 weeks. Researchers evaluated cardiovascular safety by measuring changes in QT interval, blood pressure, and heart rate. Efficacy was determined by measuring changes in perceived alertness and calmness with Bond and Lader mood scales, sleep disturbance with the Pittsburgh sleep quality index, and daytime sleepiness with the Epworth sleepiness scale.
• Acute effects crossover study (2023): Researchers evaluated the acute effect of AGE on mental alertness, accuracy, and fatigue through a randomized, double-blind, placebo-controlled, cross-over clinical study in healthy human subjects. Sixty-two adults were randomized to receive either 300 mg of AGE or placebo 30 minutes after lunch on Day 1, followed by crossover treatments on Day 7. The primary outcome was evaluation of mental alertness and accuracy, assessed by the Symbol Digit Coding test, Shifting Attention test, Stroop Test, and Alertness Rating Scale of CNS Vital Signs at baseline, 0.5, 1, 2, and 5 hours post dose.
• Four-week supplementation crossover study (2023): A randomized, double-blind, placebo-controlled, cross-over, clinical interventional study evaluated the efficacy and safety of A. galanga extract (AGE), commercially known as EnXtra®. A total of 62 subjects were randomized to receive either placebo or AGE. Subjects were instructed to consume one capsule every day 30 minutes after lunch for 28 days in period I and II, with a washout period of 10 days between the two periods.

Evidence characterization: In humans, A. galanga was studied for its effects as psychostimulants improving mental health. The clinical studies conducted to date have been primarily industry-sponsored (with disclosed conflicts of interest including involvement from Enovate Biolife, the manufacturer of EnXtra®), and while they are randomized and placebo-controlled, independent replication is lacking. The body of human clinical evidence should be considered preliminary.

5.2 Anti-Inflammatory and Joint Health

Of the approximately 248 members of the genus Alpinia, the most commonly studied for their anti-inflammatory activities are A. galanga, A. officinarum, A. zerumbet, and A. oxyphylla. Only A. galanga, A. officinarum, and A. zerumbet have been studied in humans.

Studies in animal models revealed that the plants contributed as exogenous antioxidants, reduced proinflammatory cytokines, inhibited proinflammatory enzymes, improved gastric acid and gastrointestinal motility, and promoted ulcer healing.

Human chondrocyte study (in vitro, human tissue): A. galanga extract was investigated for its effects on metabolism and gene expression in human chondrocyte and synovial fibroblast metabolism. A. galanga extract inhibited IL-1β-enhanced matrix breakdown of cartilage explants in a dose-dependent manner. It suppressed uronic acid loss from the tissue and decreased the release of sulfated GAG and hyaluronan into the medium. MMP-2 and MMP-9 activity in the culture medium of chondrosarcomas and synovial fibroblasts were significantly reduced in the presence of A. galanga extract, which also suppressed the production of MMP-1, -3, and -13. The extract also significantly increased type II collagen, SOX9, and aggrecan gene expression, suggesting an ability to enhance anabolic activity.

Evidence characterization: Anti-inflammatory evidence is primarily derived from in vitro and animal models. Mechanistic pathways (NF-κB, COX-2, TRPV1, ERK) are well described at the preclinical level. There is a notable absence of well-powered randomized controlled trials in human subjects for arthritis or inflammatory conditions specifically using A. galanga.

5.3 Antimicrobial Activity

The antimicrobial, antifungal, and antiviral potential of A. galanga has been noted across several studies. Crude and concentrated extracts have shown inhibitory activity against pathogens such as Staphylococcus aureus, Pseudomonas aeruginosa, E. coli, and others commonly involved in human infections.

The antiplasmid activity of 1′-acetoxychavicol acetate from Alpinia galanga against multi-drug resistant bacteria was reported in the Journal of Ethnopharmacology (Latha et al., 2009).

Evidence characterization: Evidence is entirely in vitro and/or in animal models. No clinical trials evaluating A. galanga for human infectious disease outcomes have been identified in the literature reviewed.

5.4 Anticancer and Chemopreventive Effects

Review of the available literature provides a comprehensive report on Alpinia galanga having anti-proliferative, apoptotic, anti-angiogenic, as well as cytotoxic efficacy and their mode of action in vitro as well as in vivo conditions.

Anticancer effects have been observed: ethanolic extracts have been found to significantly reduce viability in MCF-7 breast cancer cells by inducing morphological changes.

Two chalcones from Alpinia galanga showed cytotoxicity toward four cancer cell lines — KB, MCF7, A549, and HepG2 — with one compound strongly inhibiting the growth of A549 cancerous cells with an IC50 of 6.81 μM.

Molecular docking was used to assess the binding affinity of the most enriched constituents in A. galanga rhizome extract (AgRE) toward the active sites of NADPH oxidase and p53 tumor suppressor protein (TP53).

Evidence characterization: All anticancer evidence reviewed is from in vitro cell-line studies and animal models. Systematic clinical validation, regulatory approval, and standardization remain critical to transform these findings into evidence-based therapeutic interventions. No human clinical trials establishing efficacy for cancer prevention or treatment are currently available.

5.5 Antidiabetic Effects

The ethanolic extract of galangal has been shown to have potent antiseptic activity and may be able to effectively block the enzymes α-glucosidase and amylase — two key enzymes in dietary carbohydrate digestion. Flavone from A. galanga strongly exhibited antioxidative activity to scavenge DPPH radicals with an IC50 of 51.68 μM. Flavone and flavanone constituents moderately inhibited enzyme α-glucosidase with IC50 values of 296.34–324.64 μM.

Evidence characterization: Antidiabetic evidence is exclusively preclinical (in vitro and rodent models). No human clinical trials for glycemic control using A. galanga have been identified in the sources reviewed.

5.6 Respiratory and Asthma-Related Effects

A preclinical PMC study examined the effects of ACA in an ovalbumin-induced asthma mouse model. Biological properties of A. galanga and its constituents include anticarcinogenic effects, chemoprevention through COX-2 suppression, antioxidative actions, and inhibition of TNF-α and IL-4. In addition, hydroxychavicol acetate, one of the constituents of A. galanga, increases IL-2 production and attenuates IFN-γ expression.

Antiallergic principles from Alpinia galanga — specifically structural requirements of phenylpropanoids for inhibition of degranulation and release of TNF-α and IL-4 in RBL-2H3 cells — were described in Matsuda et al., Bioorganic & Medicinal Chemistry Letters, 2003.

Evidence characterization: Preclinical only. No human trials for asthma or respiratory conditions have been identified.

5.7 Immunomodulatory Effects

A. galanga extract displayed inhibitory activity on the release of proinflammatory mediators (ROS, TNF-α, IL-6, and NO), and enhanced the release of IL-10 in LPS-stimulated RAW 264.7 cells. The extract also showed inhibition on the release of inflammatory enzymes (COX-2, iNOS, and MMP-9) by inhibiting LPS-induced activation of JAK signaling.

Immunostimulating activity of the hot water-soluble polysaccharide extracts of Alpinia galanga has also been reported.

Evidence characterization: Evidence is in vitro. No human immunological endpoints have been tested in well-designed clinical trials.

5.8 Antiviral Activity

1'S-1'-Acetoxychavicol acetate isolated from Alpinia galanga was shown to inhibit human immunodeficiency virus type 1 (HIV-1) replication by blocking Rev transport (Journal of General Virology, 2006).

Evidence characterization: In vitro data only. No clinical antiviral trials using A. galanga have been identified.

5.9 Male Reproductive Health

In human studies, A. galanga was studied for its effects including improving sperm motility and erectile dysfunction. In an animal toxicity study, gain in weights of sexual organs and increased sperm motility and sperm counts were observed in A. galanga-treated mice, and these changes were highly significant in the A. galanga-treated group.

Evidence characterization: Limited human and animal data. Requires further independent clinical study.

6. Body Systems and Health Areas of Association

• Digestive/gastrointestinal system: Traditionally used to treat digestive issues, respiratory ailments, joint pain, and skin conditions, as documented in Ayurveda and Southeast Asian folk medicine.
• Central nervous system (cognitive function): Supported by multiple human RCTs at a preliminary level for mental alertness and focus.
• Musculoskeletal system: Used in traditional medicine for the treatment of rheumatism. Preclinical evidence for cartilage protection.
• Immune system: In vitro evidence for modulation of inflammatory cytokines and immune cell activation.
• Respiratory system: Galangal is widely used as a traditional herb to treat various diseases such as rheumatism, asthma, bronchitis, and chronic enteritis.
• Skin/dermatological system: In vitro evidence for anti-psoriatic activity via NF-κB modulation; ACA and galangin show protection of dermal fibroblasts from senescence.
• Endocrine/metabolic system: Preclinical evidence for α-glucosidase and amylase inhibition relevant to blood glucose regulation.
• Oncology (experimental): Preclinical (cell-line and animal) evidence for anti-proliferative, pro-apoptotic, and anti-angiogenic effects.

7. Dosage Forms and Reported Dosages

The following dosages are reported as stated in identified studies; they do not constitute dosing recommendations.

• 300 mg of standardized rhizome extract (EnXtra®), single dose, oral capsule: Used in a crossover RCT where 62 adults were randomized to receive either 300 mg of AGE or placebo 30 minutes after lunch on Day 1, followed by crossover treatment on Day 7.
• 300 mg EnXtra®, once daily for 28 days: Used in a randomized, double-blind, placebo-controlled crossover study of 62 subjects who were instructed to consume one capsule every day 30 minutes after lunch for 28 days in each period.
• 300 mg EnXtra® twice daily for 12 weeks (with and without caffeine): Participants were assigned to receive either 300 mg EnXtra with 200 mg of caffeine, 300 mg of EnXtra alone, or placebo twice per day for 12 weeks.
• Animal toxicity dosages: Acute and chronic (90 days) oral toxicity studies on ethanolic extracts of the rhizomes of A. galanga were carried out in mice. Acute dosages were 0.5, 1.0, and 3 g/kg body weight, while the chronic dosage was 100 mg/kg/day as the extract.

8. Safety Profile and Notable Considerations

General Safety in Toxicity Studies

All external morphological, hematological, and spermatogenic changes, in addition to body weight and vital organ weights, were recorded in a 90-day animal toxicity study. During this investigation, no significant mortality compared to controls was observed.

A hexane extract of galangal rhizome evaluated for acute dermal, oral, and intraperitoneal toxicities using OECD guidelines showed that the undiluted crude galangal extract showed negligible irritation on non-abraded skin of New Zealand white rabbits with a 0.25 primary irritation index. The single oral dose of the galangal extract at 2000 mg/kg did not produce mortality or significant changes in general behavior, body weights, feed intake, or biochemical analysis (ALT, AST, BUN, and creatinine levels) of Wistar rats compared to controls.

Subchronic Toxicity and NOAEL

There is some evidence of safety and tolerability in humans for a proprietary A. galanga rhizome extract (EnXtra™), and it is Generally Recognised as Safe (GRAS) in the US. Sprague Dawley rats were orally administered the test item for 90 days following OECD Test Guideline 408, with a recovery period of 28 days. Cumulative effects and No Observed Adverse Effect Level (NOAEL) were estimated. On terminal sacrifice, no treatment-related adverse effects were observed, including clinical signs, mortality, body weight changes, and feed consumption parameters. Haematology, clinical biochemistry, and thyroid hormone levels were within the normal range. No treatment-related gross and microscopic pathological lesions were observed across the treatment groups. Based on the results of the toxicological evaluation, NOAEL of A. galanga rhizome extract (AGRE) was fixed at 3,000 mg/kg body weight per day, and the acceptable daily intake (ADI) was estimated at 1,800 mg/day in the case of humans.

Skin Application

The undiluted crude galangal extract showed negligible irritation on non-abraded skin of New Zealand white rabbits (0.25 primary irritation index), whereas the abraded skin of the rabbits showed irritation for all tested dilutions of galangal extracts (0.75 g/ml, 0.5 g/ml, 0.25 g/ml, and 0.125 g/ml). This indicates a potential for irritation when applied to damaged or abraded skin.

Reproductive Effects in Animal Models

The gain in weights of sexual organs and increased sperm motility and sperm counts were observed in A. galanga-treated mice, and both extracts failed to show any spermatotoxic effects.

Cardiovascular Safety in Human Trials

In the 12-week human clinical trial, researchers evaluated cardiovascular safety by measuring changes in QT interval, blood pressure, and heart rate. No safety concerns were observed throughout that study.

Conflict of Interest and Evidence Quality Note

In the key cognitive alertness studies, Dr. Mark S. Mennemeier was funded in the form of consultation fees by Enovate Biolife to design and review the study, and Enovate Biolife provided support in the form of salaries to the lead investigators who hold full-time positions within the organization. Readers should weigh this financial relationship when interpreting results. Independent replication of the cognitive outcomes data is needed to establish confidence in clinical conclusions.

Current Regulatory and Standardization Status

Systematic clinical validation, regulatory approval, and standardization remain critical to transform the available preclinical findings into evidence-based therapeutic interventions. The plant is recognized as a food ingredient and spice across its native region, and its rhizome is consumed in significant quantities as part of traditional cuisines with a long history of culinary use.

References

• World Journal of Biology Pharmacy and Health Sciences (2025): Alpinia galanga (L.) Willd: A comprehensive review on phytochemistry, pharmacology, and nanotechnology
• Chouni A, Paul S. A Review on Phytochemical and Pharmacological Potential of Alpinia galanga. Pharmacognosy Journal, 2018, Vol. 10, Issue 1.
• ResearchGate: A Review on Phytochemical and Pharmacological Potential of Alpinia galanga (Chouni & Paul, 2017)
• ScienceOpen (BioIntegration, 2024): Ethnomedical Potentials, Phytochemicals, and Medicinal Profile of Alpinia galanga L.: A Comprehensive Review
• ScienceDirect Topics: Alpinia galanga — Overview
• PMC (Pharmaceuticals, 2022): Antioxidant, Antibacterial, Enzyme Inhibitory, and Anticancer Activities and Chemical Composition of Alpinia galanga Flower Essential Oil
• PubMed (Pharmacogn Rev, 2018): A Review on the Pharmacological Activities and Phytochemicals of Alpinia officinarum (Galangal) Extracts Derived from Bioassay-Guided Fractionation
• Wikipedia: Alpinia galanga
• Wikipedia: Alpinia officinarum (Lesser Galangal)
• PMC (Evidence-Based Complementary and Alternative Medicine, 2013): 1′-Acetoxychavicol Acetate Isolated from Alpinia galanga Ameliorates Ovalbumin-Induced Asthma in Mice
• PMC (Frontiers in Pharmacology, 2020): Revealing the Reversal Effect of Galangal (Alpinia galanga L.) Extract Against Oxidative Stress in Metastatic Breast Cancer Cells
• PMC (Journal of Experimental Pharmacology, 2025): Anti-Inflammatory Activities of Some Plants of Genus Alpinia: Insights from In Vitro, In Vivo, and Human Studies
• Tandfonline (Journal of Experimental Pharmacology, 2025): Anti-Inflammatory Activities of Some Plants of Genus Alpinia
• PMC (Frontiers in Aging Neuroscience, 2018): Galangin Reduces the Loss of Dopaminergic Neurons in an LPS-Evoked Model of Parkinson's Disease in Rats
• PMC (Frontiers in Pharmacology, 2023): Immunomodulatory Effects and Mechanisms of the Extracts and Secondary Compounds of Zingiber and Alpinia Species
• PMC (Frontiers in Pharmacology, 2024): Analgesic and anti-inflammatory effects of galangin: a potential pathway to inhibit transient receptor potential vanilloid 1 receptor activation
• PMC (Evidence-Based Complementary and Alternative Medicine, 2018): Effects and possible mechanisms of Alpinia officinarum ethanol extract on indomethacin-induced gastric injury in rats
• De Gruyter (J Complement Integr Med, 2022): Subchronic toxicological evaluation of EnXtra™ (standardised extract of Alpinia galanga rhizome) in rats
• PubMed (Planta Medica, 1992): Toxicity studies on Alpinia galanga and Curcuma longa
• IJPSR: Safety Evaluation of Galangal (Alpinia galanga) Extract for Therapeutic Use as an Antimicrobial Agent
• Nutritional Outlook: New study shows the safety and efficacy of nootropic Alpinia galanga extract (2020 — reports on JACN trial)
• Journal of the American College of Nutrition (2017): Effect of Alpinia galanga on Mental Alertness and Sustained Attention With or Without Caffeine
• Crimson Publishers (2023): Acute Effects of Alpinia galanga Extract on Mental Alertness, Accuracy and Fatigue in Human Subjects: A Randomized, Double-Blind, Placebo-Controlled, Cross-Over Study
• Gavin Publishers (Curr Res Cmpl Alt Med, 2023): Alpinia galanga Extract Increases Alertness, Focus, and Energy While Lowering Fatigue and Daytime Sleepiness with Four Weeks Supplementation
• Springer (Central European Journal of Biology, 2007): Effect of Alpinia galanga extract on cartilage degradation and on gene expression in human chondrocyte and synovial fibroblast metabolism
• ScienceDirect (Heliyon, 2024): Phytochemical analysis, antioxidant, anticancer, and antibacterial potential of Alpinia galanga (L.) rhizome
• ScienceDirect (Industrial Crops and Products, 2021): Discovery of 1'-acetoxychavicol acetate (ACA) as a promising antibacterial compound from galangal (Alpinia galanga)
• International Journal of Plant & Environment: Phytochemistry, Pharmacology and Ethnobotany of Alpinia