IngredientesAnthocyanins are natural water-soluble pigments that are commonly found in the sap of plant cells, and they are the main factors underlying the red, blue, and purple colors of certain vegetables, fruits, and grains. They are phenolic compounds belonging to the flavonoids family. The physicochemical properties of anthocyanins are a function of their intricate molecular structure, featuring a dual benzene ring configuration and a densely packed molecular system. This molecular composition imparts notable polarity to anthocyanins, rendering them readily soluble in water.
The anthocyanins are 2-phenylbenzopyrylium derivatives of dietary phenolics, built upon a positively charged flavylium (2-phenylbenzopyrylium) cation core. Anthocyanins can be further divided based on their substitutions at the skeleton, especially at ring B, or the glycosylation at ring A and C. Without a sugar attached, they are called anthocyanidins, the most common ones being pelargonidin, cyanidin, peonidin, delphinidin, and malvidin. Main sugar moieties are the monosaccharides glucose, arabinose, and galactose, as well as the disaccharide rutinose (6-O-α-l-rhamnosyl-d-glucose). Generally, cyanidin is the most abundant anthocyanidin and cyanidin-3-glucoside the most common anthocyanin.
When anthocyanins are extracted from botanical sources, they exhibit an exceptional susceptibility to degradation. This degradation is affected by various factors including acidity, temperature, their own concentration, exposure to light, oxygen, enzymatic activity, cofactors, microorganisms, and metal ions.
Natural dietary sources of anthocyanins are dark berries such as bilberries, blackberries, or blackcurrants and red berries such as strawberries, cranberries, or redcurrants. Anthocyanins are polyphenolic plant constituents and are the most commonly occurring flavonoids in many fruits, especially berries, and in several vegetables. Anthocyanin consumption is approximately nine times higher than other nutritional flavonoids in certain food products.
Anthocyanins are commonly found in flowers and the fruits of many plants. Most of the red, purple, and blue-colored flowers contain anthocyanins. Red flowers include red hibiscus, red rose, red pineapple sage, red clover, and pink blossom. Blue (cornflower, blue chicory, and blue rosemary) and purple (purple mint, purple passion flower, purple sage, common violet, and lavender) flowers are also common sources. Beyond berries, anthocyanin-rich black carrot, red cabbage, and purple potato are potential functional foods that have been consumed for prevention of diseases.
Anthocyanins exhibit antioxidant properties and prophylactic effects in the immune and cardiovascular systems, confer protection against cancer, and contribute to the prevention of cardiovascular diseases. Thus, their incorporation into functional foods, pharmaceuticals, supplements, and cosmetic formulations aims at promoting human well-being.
Anthocyanins are regarded as the largest, most interesting, and intriguing group of plant-based pigments under use by humans from very early times as colorants for foods, beverages, and clothes, as well as phytopharmaceuticals and colors for drawings and cave-arts. In contemporary commerce, anthocyanins are available as standardized berry extracts (particularly bilberry and elderberry), as freeze-dried fruit powders, as purified or semi-purified concentrates encapsulated in capsule or tablet form, and as ingredients in functional beverages. Besides direct extraction from natural resources, anthocyanins can also be obtained by semi- or total synthesis.
Since ancient times, human beings have consumed plants, and different cultures have found many health benefits from them. These have been attributed to the magical powers that plants possess or to the divine intervention of gods. However, since the advent of science and research, it has been found that these curative benefits come from a high content of secondary metabolites such as anthocyanins, flavonoids, terpenes, and phenols, among many other compounds, whose biological and pharmacological activity has been proven.
Anthocyanins were components of the traditional herbal medicines used by North American Indians, the Europeans, and the Chinese, and were habitually derived from dried leaves, fruits (berries), storage roots, or seeds. Anthocyanin-rich mixtures and extracts (though not purified compounds) have been used historically to treat conditions as diverse as hypertension, pyrexia, liver disorders, dysentery and diarrhoea, urinary problems including kidney stones and urinary tract infections, and the common cold. They have even been purported to yield improvements to vision and blood circulation.
The roles of anthocyanin pigments as medicinal agents have been well-accepted dogma in folk medicine throughout the world. Anthocyanins from Hibiscus sp. have historically been used in remedies for liver dysfunction and hypertension; and bilberry (Vaccinium) anthocyanins have an anecdotal history of use for vision disorders, microbial infections, diarrhea, and diverse other health disorders.
Various African, Asian, and pre-Columbian cultures, among others, have understood the healing powers of many plants from ancestral knowledge. Some of these flowers and plants have been traditionally used as folk medicine, as colorants, and as food. In addition to traditional usage, red, purple, and blue-colored fruits are commonly consumed for their beneficial effects.
A well-documented example of historical use involves European bilberry during World War II. British Air Force pilots consumed blueberry jam in night flights to obtain clear night vision. This anecdotal wartime practice prompted later scientific investigation into anthocyanin-related visual effects.
The biological activity of anthocyanins is principally attributed to their aglycone (sugar-free) forms, the anthocyanidins. The most common anthocyanidins are pelargonidin, cyanidin, peonidin, delphinidin, and malvidin. Each differs in the number and arrangement of hydroxyl and methoxy groups on the B-ring, which affects both color expression (which is also pH-dependent) and antioxidant potency. The most well-known anthocyanins are cyanidin-3-O-glucoside and cyanidin-3-O-rutinoside. They are widespread in nature, being present in considerable amounts in red fruits and red vegetables.
Among them, anthocyanins have been a target of many studies due to the presence of catechol, pyrogallol, and methoxy groups in their chemical structure, which confer notable scavenging, anti-apoptotic, and anti-inflammatory activities. The number of free hydroxyl groups on ring B is a key determinant of radical-scavenging capacity; delphinidin, bearing a trihydroxy B-ring, typically exhibits greater antioxidant activity than pelargonidin, which has only a single hydroxyl group.
Acylation of the glycosyl moieties of anthocyanins alters the physicochemical properties of anthocyanins and improves their stability. Thus, acylated anthocyanins with probiotic-like property and lower bioavailability are likely to have different biological effects from nonacylated anthocyanins on diabetes.
The antioxidant activity of anthocyanins can effectively eliminate free radicals, reduce the stimulation of inflammation, reduce the secretion of inflammatory factors, inhibit the activation of inflammation-related signal pathways, stimulate the production of anti-inflammatory factors, and effectively reduce the inflammatory reaction.
This body of research discusses the potential anti-inflammatory mechanism of anthocyanins from three aspects: Toll-like receptor signaling, MAPKs (mitogen-activated protein kinases), and NF-κB and oxidative stress. More specifically, in cerebral ischemia, anthocyanins reduce neuroinflammation by decreasing the expression of Toll-like receptor 4 (TLR4), an activator of nuclear factor kappa B (NF-κB), and tumor necrosis factor-α (TNF-α) proinflammatory cytokine expression.
Anthocyanins promote activation of Nuclear factor erythroid 2-related factor 2 (Nrf2) and the consequent increase in the expression of the Heme oxygenase-1 (HO-1) and γ-glutamyl cysteine synthase (γ-GCS) genes, contributing to a decrease in brain levels of superoxide and lipid peroxidation.
Anthocyanins exert protective effects by targeting multiple key signaling pathways, including mitogen-activated protein kinase (MAPK), nuclear factor-kappaB (NF-κB), Wingless-related integration site (Wnt)/β-catenin, phosphatidylinositol 3-kinase/protein kinase B (PI3K/Akt), adenosyl monophosphate-dependent protein kinase (AMPK), and oxidative stress signaling.
In peripheral tissues such as the liver, muscle, and pancreas, anthocyanins activate key molecular pathways, including AMPK, PPARγ, NRF2/Keap1, and NF-κB, leading to reduced inflammation, increased insulin sensitivity, and decreased lipogenesis, glycemia, and dyslipidemia.
The primary mode of intestinal absorption of anthocyanins is through both sGLT1 and GLUT2 glucose transporters. Stronger binding affinities may allow anthocyanins to be more inhibitive to glucose absorption compared to the reverse, where GLUT2 expression may also be affected.
The ability of anthocyanins to inhibit the initiation and development of a tumour is closely associated with their ability to increase antioxidant defences, exert anti-inflammatory actions, and interfere with the ERK, JNK, PI3K/Akt, MAPK, and NF-κB pathways.
Recent evidence suggests that health-promoting effects attributed to anthocyanins may also be related to modulation of gut microbiota. Short-chain fatty acids (SCFAs) and anthocyanins stimulate the secretion of gut hormones (GLP-1 and PYY) and adipokines (leptin and adiponectin), contributing to improved metabolic signaling.
Bioavailability is one of the central challenges in translating in vitro and animal findings on anthocyanins to clinical benefit. Anthocyanins are reported to have low bioavailability, with the majority of studies recording a recovery of less than 1% of the ingested anthocyanin dose. Blueberry anthocyanins in humans have been stated to have poor bioavailability, with estimates of 0.26% to 1.8%. This is mainly due to their rapid metabolism and excretion.
Anthocyanins that are commonly ingested from the diet are largely conjugated, metabolized by colon microbiota, and excreted in the urine and feces, yielding a rather low bioavailability. Some evidence has come forth supporting the idea that the dietary phenolics bioactive forms in vivo are not necessarily those which occur in nature, but rather conjugates or metabolites arising from them in the human body.
Specific pharmacokinetic data from human studies have been reported: in adult men, a single oral administration of 721 mg of a mixture of cyanidin-3-glycosides leads to a cumulative serum concentration of both parent anthocyanins and their metabolites equal to about 377 nmol/L·h, with a peak concentration of 96 nmol/L at 2.8 hours. The total urinary excretion of ingested anthocyanins over 24 hours was 1,071 µg.
It has been demonstrated that in humans, absorption, gastrointestinal transit, and plasma elimination times depend on anthocyanin structure. In a study involving the administration of purple carrots containing five different 3-O-glycosides of cyanidin to 12 healthy volunteers, the efficiency of absorption of acylated compounds was lower than that observed for non-acylated anthocyanins.
Only a small fraction of ingested anthocyanins appear in the circulation in their intact form, as most are extensively metabolized in the gut and liver into glucuronide, sulfate, and methylated derivatives. Distribution to tissues in humans is poorly characterized, though animal studies indicate accumulation in liver, kidneys, brain, and adipose tissue at low concentrations. When considering clinical applicability, several factors must be addressed: the molecular form (glycosylated vs. aglycone), the food matrix (whole fruit versus extract vs. supplement), processing and digestion, interactions with other dietary components (fibers, fats, other polyphenols), inter-individual variability (microbiota composition, metabolism, transporters), and the need for standardized effective doses.
Growing studies have found that anthocyanin metabolites retained their basic anthocyanin structure. Hence, most of their biological activities may be retained, which may partly explain why health benefits are observed despite low circulating levels of intact parent compounds.
Epidemiological studies have suggested an association between anthocyanin intake and improved cardiovascular risk, type 2 diabetes, and myocardial infarct. Clinical studies using anthocyanins have shown a significant decrease in inflammation markers and oxidative stress, a beneficial effect on vascular function and hyperlipidemia by decreasing low-density lipoprotein and increasing high-density lipoprotein.
The most rigorous synthesis of the clinical evidence to date comes from large meta-analyses of randomized controlled trials. A meta-analysis that included 44 eligible RCTs and 15 prospective cohort studies found that pooled analysis of RCTs showed that purified anthocyanin supplementation could significantly reduce blood LDL cholesterol (weighted mean difference [WMD]: −5.43 mg/dL, 95% CI: −8.96, −1.90 mg/dL; p = 0.003) and triglyceride (WMD: −6.18 mg/dL, 95% CI: −11.67, −0.69 mg/dL; p = 0.027), while increasing HDL cholesterol (WMD: 11.49 mg/dL, 95% CI: 7.43, 15.55 mg/dL; p < 0.001) concentrations.
Purified anthocyanins also markedly decreased circulating tumor necrosis factor alpha (WMD: −1.62 pg/mL, 95% CI: −2.76, −0.48 pg/mL; p = 0.005) and C-reactive protein (WMD: −0.028 mg/dL, 95% CI: −0.050, −0.005 mg/dL; p = 0.014). Administration of anthocyanin-rich berries could significantly lower blood total cholesterol (WMD: −4.48 mg/dL, 95% CI: −8.94, −0.02 mg/dL; p = 0.049) and C-reactive protein (WMD: −0.046 mg/dL, 95% CI: −0.070, −0.022 mg/dL; p < 0.001).
A separate systematic review of RCTs from 2016 that analyzed 12 trials found consistent improvements in LDL cholesterol among people with elevated biomarkers, but mixed results for blood pressure. Supplementation with anthocyanins significantly improved LDL cholesterol among diseased individuals or those with elevated biomarkers. Supplementation did not significantly affect other markers of CVD in either healthy individuals or those with elevated markers. Assessment of heterogeneity included the duration of the trials (3–24 weeks), dose of anthocyanins administered (7.35–640 mg/day), raw material source of anthocyanins, and the age, gender, health status, and body mass index of the studied populations.
A further meta-analysis of RCTs found that anthocyanin treatment was associated with decreased LDL (SMD: −0.35; 95% CI: −0.66, −0.05; I² = 85.2%) and total cholesterol (SMD: −0.33; 95% CI: −0.62, −0.03; I² = 86.9%) and marginally increased HDL (SMD: 0.24; 95% CI: −0.00, 0.49; I² = 81.1%). There was no significant pooled effect of anthocyanins on systolic blood pressure, diastolic blood pressure, or inflammatory markers, including C-reactive protein, TNF-α, and IL-6.
Evidence strength summary: The cholesterol-lowering evidence from RCTs is moderately strong and broadly consistent across meta-analyses, particularly in dyslipidemics. However, high heterogeneity (I² >80% in several analyses) and the wide variation in dose, source, and population limit generalizability. Effects on blood pressure and flow-mediated dilation remain inconsistent across trials. Neither purified anthocyanins nor anthocyanin-rich berries could cause any substantial improvements in BMI, blood pressure, or flow-mediated dilation in the largest available meta-analysis.
Evidence from pre-clinical studies indicates anthocyanins' role in glucose level regulation, gut microbiota improvement, and inflammation reduction under diabetic conditions. Therefore, incorporating these research advancements into clinical practice would significantly improve the prevention and management of type 2 diabetes.
Anthocyanin supplementation has been shown to have a regulatory effect on fasting blood glucose levels, glycated hemoglobin, and other diabetes-related indicators. Furthermore, increased anthocyanin dosages had more favorable implications for diabetes treatment.
Subgroup analyses revealed that anthocyanin treatment substantially reduced fasting glucose in subjects with hyperglycemia, LDL in subjects with dyslipidemia, and HOMA-IR (a measure of insulin resistance) among overweight and obese subjects (SMD: −0.65; 95% CI: −1.23, −0.06; I² = 45.2%).
Black rice and black bean husk anthocyanin-rich extracts modified the type 2 diabetes rat intestinal microbiota by enhancing the abundance of short-chain fatty acid (SCFA)-producing bacteria, thereby inducing the growth of beneficial Akkermansia spp., Phascolarctobacterium spp., Bacteroides spp., and Coprococcus spp. Also, in a recent study, combined metformin and anthocyanin treatment had a positive regulatory effect on the intestine by increasing the abundance of the Lactobacillus and Bifidobacterium phylum. These studies demonstrate that anthocyanins may exert their anti-diabetic effects by modulating microbial populations, thereby improving their richness and the proportion of gut microbes' beneficial populations.
Evidence strength summary: There is a growing body of human clinical evidence supporting a modest beneficial effect of anthocyanins on glycemic markers, especially in individuals who already have hyperglycemia or insulin resistance. Mechanistic and preclinical evidence is robust, but human RCTs remain moderate in number, varied in dose and source, and many are short in duration. Larger, longer, and better-standardized trials are needed.
The neuroprotective effects of anthocyanins are mainly due to their ability to cross the blood–brain barrier and protect neurons and glia cells from oxidative damage induced by reactive species and free radicals, reduce the inflammatory cytokines and β-amyloid concentrations, and to suppress NF-κB, Nrf-2 signaling, COX, and caspase activities.
Anthocyanins are well-known to have potent antioxidant and anti-inflammatory activity, which explains the various biological effects reported for these substances, suggesting their antidiabetic and anticancer activities, and their role in cardiovascular and neuroprotective prevention.
A systematic review and meta-analysis of randomized clinical trials examining cognitive outcomes found noteworthy heterogeneity. Most significant cognitive improvements that were observed in the studies included in this review were from those conducted in healthy young participants. It is feasible that anthocyanin metabolite bioavailability may be decreased in older adults, both peripherally and in the brain. Furthermore, individuals with impaired cognitive function resulting from vascular and nonvascular dementia and Alzheimer's disease may respond differently to anthocyanin administration compared to healthy adults. Individual variability in anthocyanin bioavailability may have contributed to the varied effects observed in the cited studies; therefore, pharmacokinetic studies (including different populations across age and cognitive function categories) are required.
Evidence strength summary: Neuroprotective effects of anthocyanins are well characterized in animal models and in vitro systems. Human clinical evidence of cognitive benefit exists, but is preliminary and primarily confined to healthy young adults. Evidence in older adults and those with neurodegenerative conditions is limited, mechanistically plausible, and requires substantially more rigorous investigation.
Bilberry anthocyanins modulated oxidative stress defense enzymes heme oxygenase-1 (HO-1) and glutathione S-transferase-pi (GST-pi) in human retinal pigment epithelial cells. Compounds in bilberry called anthocyanins can regenerate rhodopsin, a pigment found in retinal cells responsible for eyesight.
In studies using light-induced retinal photoreceptor degeneration, which is a widely used model of human retinal dystrophies, neuroprotection by blueberry species was convincingly documented with both long-term (5–35 d) and short-term (2–72 h) prophylactic treatments with daily anthocyanin doses between 10 and 500 mg.
However, translation to human visual outcomes is more uncertain. In a systematic review of 30 clinical studies examining the bilberry effect on vision in reduced light conditions, Canter and Ernst found that testing of psychophysical outcome parameters was weak evidence due to a lack of strict study designs (e.g., non-randomized or non-placebo controlled trials).
Evidence strength summary: Preclinical evidence for ocular protection by bilberry anthocyanins is compelling. Human clinical evidence for night vision improvement specifically is weak due to methodological limitations of the available trials. Evidence for reduction in eye strain (asthenopia) from visual display terminal work is preliminary. Overall, ocular claims require substantially more rigorous human RCTs.
Many researchers have shown that anthocyanins have therapeutic effects on diseases such as circulatory, nervous, endocrine, digestive, sensory, urinary, and immune systems. Additionally, a large number of studies have reported that anthocyanins have an anticancer effect through a wide range of anti-inflammatory and antioxidant effects.
Bilberry showed anticancer effects in preclinical models and protected against chemo-induced oral mucositis. Preliminary findings suggest bilberry extract reduces proliferation of colorectal cancer cells and a proprietary mixed herbal extract relieves chemo/radiotherapy-induced mucositis in pediatric and adult cancer patients. However, the extent to which bilberry itself was responsible for such effects is unclear.
Administration of anthocyanins at doses ranging from 0.5–2.0 grams daily for 7 days in colorectal cancer patients with dose-dependent concentrations detected in plasma and urine was documented with no toxicities.
Evidence strength summary: Anticancer evidence for anthocyanins is primarily preclinical (cell culture and animal models). A small number of early-phase human studies have been conducted, mainly examining colorectal cancer biomarkers and chemoprotection against mucositis. The evidence is currently insufficient to support clinical chemopreventive or antitumor claims, and much more human research is required.
Anthocyanins possess various pharmacological and biological activities, including anti-apoptotic, antioxidant, anti-inflammatory, and immunosuppressive properties. Anthocyanins exert protective effects against rheumatoid arthritis through multiple molecular mechanisms, including immunomodulation (inhibiting Th17, promoting Treg, regulating Tfh/Tfr, and downregulating CD38+ NK cell activity), anti-inflammatory responses (blocking the IL-17A/IL-17RA/JAK-STAT3 pathway, inhibiting NF-κB and MAPKs), joint protection (inhibiting MMPs/collagenase and osteoclast differentiation), and antioxidant effects.
Evidence strength summary: Evidence for anti-inflammatory and musculoskeletal benefits of anthocyanins is predominantly from in vitro and animal studies. Human clinical evidence in this domain is limited. The mechanistic rationale is well established, but clinical confirmation in defined musculoskeletal disease populations is still required.
Research reviews the benefits of anthocyanin-rich foods in preventing obesity, including antioxidant and anti-inflammatory effects, and in regulating the gut microbiota in preclinical models and human clinical trials. Evidence suggests that dietary anthocyanins may have anti-obesity effects and reduce the risk of chronic noncommunicable diseases by regulating gut health.
Acylated anthocyanins with probiotic-like property and lower bioavailability are likely to have different biological effects from nonacylated anthocyanins on diabetes. Acylated anthocyanins may have greater modulating effects on energy metabolism, inflammation, and gut microbiota in type 2 diabetes compared to nonacylated anthocyanins.
Evidence strength summary: The interaction between anthocyanins and the gut microbiome is an emerging and mechanistically credible field. Most of the evidence currently comes from animal models and limited human mechanistic studies. This area is rapidly evolving.
A wide range of dosages has been investigated across human studies, reflecting the diversity of sources, extraction methods, and study populations. The following dosages are reported directly from the cited clinical and review literature:
It is important to note that the optimal dose for any specific health outcome in humans has not yet been established, and standardization of dosing across products varies considerably depending on extraction method and plant source.
Despite their low absorption and rapid metabolism, the regular consumption of anthocyanins is considered safe. No adverse effects regarding anthocyanin consumption have been reported in the broader literature. In human studies, most people who consumed 160 mg of anthocyanins twice a day for 2 months tolerated the extract; only 4% of the participants revealed side effects, namely at the gastrointestinal level and eczema.
Acute toxicity testing involved administering 300 mg/kg cyanidin orally to Sprague-Dawley rats for 14 days; a subacute toxicity study followed OECD 407 guidelines, administering 7.5, 15, and 30 mg/kg/day cyanidin orally to adult rats for 28 days. Acute toxicity testing indicated an LD50 exceeding 300 mg/kg/day with no adverse effects. Subacute toxicity demonstrated well-tolerated responses at doses of 7.5–30 mg/kg/day for 28 days. No significant alterations in organ weights, hematological parameters, or liver/kidney functions were observed, and histopathological examination revealed no adverse findings.
Interaction of anthocyanins with drug-metabolizing enzymes and transporters may affect the fate of co-administered drugs and thus exert pharmacological consequences. Anthocyanins are known to interact with the metabolism of some medicines widely used in those with obesity-related metabolic diseases, such as some antihypertensive and cardiovascular treatment drugs (e.g., celiprolol and nadolol, digoxin and verapamil), and hypolipidemic drugs (such as simvastatin), among other medicine classes that use the cytochrome CYP3A and P-glycoprotein transporters. The administration of anthocyanin supplements in doses higher than 700 mg/day concomitantly with these drugs can lead to changes in drug bioavailability, which can cause a subtherapeutic effect or overdose.
An examination of the effects of 21 major anthocyanins and extracts from 3 food supplements on the aryl hydrocarbon receptor (AhR) – cytochrome P450 CYP1A1 signaling pathway found that pelargonidin-3-O-rutinoside and cyanidin-3,5-O-diglucoside dose-dependently activated AhR and induced CYP1A1 mRNA but not protein in cancer cell lines; however, neither compound induced CYP1A1 mRNA and protein in four different primary human hepatocyte cultures. This distinction between cancer cell lines and primary human hepatocytes cautions against over-interpreting in vitro enzyme induction data.
The excessive consumption of anthocyanins has been shown to inhibit the absorption of micronutrients such as folic acid and iron, resulting from preabsorptive interactions during digestion, which may lead to associated deficiencies.
Higher glucose content in food products could delay anthocyanin absorption, which could result from competitive action of glucose and anthocyanins on the sodium-dependent glucose cotransporter SGLT1. Urinary recovery of anthocyanins was lower after sucrose consumption, and consumption of elderberry juice with sucrose resulted in delaying anthocyanin excretion.
The main metabolite identified in urine samples was pelargonidin-monoglucuronide. Although the dose excretion curve was linear for all individuals, there was individual variation in urinary anthocyanin yields, probably due to differences in UGT (UDP-glucuronosyltransferase) levels or activity. This variability means that identical doses may produce considerably different systemic exposures between individuals.
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Anthocyanins are water-soluble flavonoid pigments with well-documented antioxidant activity supported by human clinical trial data. They scavenge free radicals directly and activate endogenous antioxidant defense pathways, including Nrf2-mediated upregulation of enzymes such as SOD and GPx. A meta-analysis of 23 RCTs found that dietary anthocyanins significantly reduced oxidative stress biomarkers (MDA, isoprostane) and increased total antioxidant capacity, SOD, and GPx activity. Evidence is stronger in subjects with underlying metabolic conditions than in healthy populations.
Anthocyanins (pigments in berries, grapes, red cabbage) improve endothelial function, reduce arterial stiffness, and lower blood pressure in clinical studies. A 2024 PMC vascular nutraceutical review implicitly includes anthocyanin-containing fruits among dietary components related to greater endothelial function. Multiple RCTs confirm reduced arterial stiffness and improved FMD with anthocyanin consumption.
Anthocyanins are flavonoid pigments (found in bilberries, black currants, elderberries, etc.) with established vascular benefits including reduction of blood pressure, improvement of flow-mediated dilation (FMD), reduction of arterial stiffness, and strengthening of capillary walls. A 2023 PMC review of clinical trials confirmed anthocyanins improve multiple vascular and endothelial biomarkers. Their mechanisms include eNOS upregulation, antioxidant protection of blood vessel walls, and anti-platelet effects.
Anthocyanins are the active class of pigment phytochemicals in bilberry and black currant with specific clinical evidence for VDT-induced eye fatigue. A PMC-indexed systematic review (Molecules 2019, PMC6767261) confirms anthocyanins relieve ciliary muscle tension, reduce visual fatigue symptoms, and improve retinal blood flow. Multiple RCTs in VDT workers using anthocyanin extracts show improvements in accommodative function, tear film stability, and subjective eye fatigue.
Anthocyanins are water-soluble plant pigments with documented anti-inflammatory effects in preclinical IBD models, including NF-κB inhibition and reduction of mucosal TNF-α and IL-6. They are found in berries, red cabbage, and other colorful fruits and are emerging subjects of IBD clinical research.
Anthocyanins are a class of flavonoid pigments found in dark berries that have been studied for their role in accelerating rhodopsin regeneration and improving dark adaptation. Clinical evidence from black currant anthocyanins shows improvement in dark adaptation speed. Anthocyanins also improve retinal microcirculation and reduce oxidative stress in photoreceptors.
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