IngredientsWild bilberry (Vaccinium myrtillus L.) is a member of the Ericaceae family and is a low-growing shrub native to northern Europe and North America. It is a perennial shrub approximately 35–60 cm in height that grows in coniferous forests, moors, and meadows of northern Europe and America, and is also present in Asia. It blooms from April through June, producing spheroidal blue/black-colored fruits approximately 5–9 mm in diameter with many seeds that ripen from July through September. Bilberry bushes grow only in wild, montane areas, and it is not possible to cultivate them due to very specific soil demands.
Common names for this plant include bilberry, European bilberry, whortleberry, and huckleberry. Bilberries, which are native to Europe, are different from North American blueberries, although the species are closely related and belong to the same genus, Vaccinium. Bilberries are non-climacteric berries with a smooth, circular outline at the end opposite the stalk, whereas American blueberries retain persistent sepals there, leaving a rough, star-shaped pattern of five flaps.
The quality specifications for bilberries are regulated by three monographs of the European Pharmacopoeia: Bilberry fruit, fresh; Bilberry fruit, dried; and Fresh bilberry fruit dry extract, refined and standardized. The bilberry fruits and fruit extracts are currently on the market as herbal medicinal products with traditional use according to two herbal monographs by the European Medicines Agency (EMA): Bilberry fruit, fresh (which also includes its standardized dry extract) and Bilberry fruit, dried; whereas the former is indicated to relieve symptoms of discomfort and heaviness of legs related to minor venous circulatory disturbances and to relieve symptoms of cutaneous capillary fragility, the latter is applied for symptomatic treatment of mild diarrhoea and minor inflammation.
Bilberry is sold as fresh, frozen, and dried whole berries, as well as in the form of preserves, jams, and juices, and increasingly, liquid or powdered concentrates are sold as food supplements. Bilberry (typically extracts of the fruit) is available as capsules and tablets of varying concentrations, ranging from 40 to 1,000 mg. The most pharmacologically relevant commercial form is a standardized dry extract. Typical bilberry products are standardized to 25% anthocyanoside content (approximately 36% anthocyanin), and 100 g of fresh fruit contains between 300 to 700 mg anthocyanin. Extracts are mainly prepared from fresh bilberry fruits by a suitable procedure using ethanol (96%) or methanol (minimum 60%) at 10–60°C, diluted with water, filtered, and afterwards concentrated and refined usually by means of ion-exchange chromatographic techniques, according to the European Pharmacopoeia. According to the European Pharmacopoeia 8.0, the refined and standardized dry extract of fresh bilberry fruit contains 32.4% to 39.6% of anthocyanins, expressed as cyanidin 3-O-glucoside chloride.
Concerns about product quality have been documented: in one analysis, anthocyanins were quantified individually in 71 commercial bilberry extracts by HPLC-DAD and 6 of them were found to be counterfeit; the anthocyanin content in bilberry extracts was in the range of 18–34%.
Bilberry utilization in human diet and its preparations have a long history preceding the Middle Ages, and since the 1700s there are written evidences of decoction preparations from dried fruits utilized in folk medicine. The ancient Greek physician Dioscorides documented the use of bilberry fruits in the 1st century AD to treat diarrhea and dysentery, leveraging their astringent properties from tannins to constrict tissues and reduce inflammation. By the 16th century, records indicate that bilberry berries were commonly used to alleviate diarrhea, urinary tract issues, scurvy, and biliary disorders, often prepared as decoctions or teas for internal consumption.
Bilberry leaves held a prominent place in traditional remedies for managing diabetes, particularly in Europe and Russia, where they were brewed into teas believed to lower blood sugar levels — a practice noted as one of the most popular herbal treatments for the condition in Russian folk medicine. A thorough review of the early history of bilberry leaf use for diabetes was written by Helmstädter and Schuster in 2010; to briefly summarize, there was no mention of antidiabetic activity in period sources before the end of the 19th century, but from that point onward, several case studies and anecdotal evidence began to appear, followed by the first larger-scale experiments.
In traditional medicine, bilberry was used to treat varicose veins, venous insufficiency, fatigue, diarrhea, and gastrointestinal complaints. In Ireland, bilberries (known as fraochán) were traditionally gathered on the last Sunday in July, known as Bilberry Sunday, for the Celtic harvest festival of Lughnasadh, which marked the end of the hungry month of July.
Bilberries are valued for their pleasant taste and are often processed into jams, preserves, pies, juices, and alcoholic beverages. In France and Italy, they are used as a base for liqueurs and are a popular flavoring for sorbets and other desserts; in Brittany, they are often used as a flavoring for crêpes; and in the Vosges and the Massif Central, bilberry tart (tarte aux myrtilles) is a traditional dessert. In Nordic countries, they are eaten fresh or made into jams and other dishes, including bilberry pie (Finnish mustikkapiirakka, Swedish blåbärspaj) and blåbärssoppa, a bilberry soup served hot or cold.
It has been reported that during World War II, British pilots ate bilberry jam thinking it would improve their night vision. Although this may have been superstition or a deliberate hoax to help conceal improvements in radar, it prompted research on bilberry and night vision. Multiple, mostly unsourced claims exist that this was a hoax purposefully created by the British to cover up the technological advancement of airplane radar systems, or purely a product of RAF pilots' famous superstitions.
Bilberry contains a variety of phenolic compounds, including flavonols (quercetin, catechins), tannins, ellagitannins, and phenolic acids, but anthocyanins make by far the largest contribution to its phytochemical mix. Bilberry is a therapeutic fruit acknowledged for its rich flavonoids, anthocyanins, carotenoids, ascorbic acid, phenolic acid, tocopherols, and vitamin content. It is one of the richest sources of natural anthocyanins.
It contains a remarkable quantity of biologically active compounds, such as quinic, malic, and citric organic acids, as well as phenolic compounds including delphinidin-3-O-galactoside (anthocyanin), delphinidin 3-O-glucoside (anthocyanin), flavonoids, myricetin, quercetin, kaempferol (flavonols), and chlorogenic acid (hydroxycinnamic acids). The bilberry fruit is a rich source of minerals, fibers, and vitamins, with more than 80% water content.
Qualitative and quantitative composition of five major anthocyanidins — delphinidin, cyanidin, petunidin, peonidin, and malvidin — has been identified and quantified by HPLC in bilberry fruits; cyanidin predominates in all crude drug samples. The total anthocyanin content in phenolic extracts of bilberry was reported at 6,000 mg per kg of fresh weight; 15 dominant compounds were identified in bilberry, comprising monoglycosides of cyanidin, delphinidin, malvidin, peonidin, and petunidin. The anthocyanin content in fresh fruit is approximately 0.1–0.5%, while concentrated bilberry extracts are usually standardized up to 25–36% anthocyanins.
These naturally occurring phenolic compounds are redox-active antioxidants as well as iron chelators. The polyphenolic compounds in bilberry provide abundant antioxidant content, which are supposed to be the vital bioactive compounds accountable for various health benefits. These pigments display a remarkable number of biochemical and pharmacological activities, and many of their pharmacological properties have been correlated to the scavenging ability of oxygen-generated free radicals and to the inhibition of lipid peroxidation.
Many studies suggest that anthocyanins, the predominant phenolic compounds found in bilberry, have anti-inflammatory effects. Suggested mechanisms include inhibiting proteasome activity (which controls the degradation of cellular proteins) and inhibiting nuclear factor κB (NF-κB) activation, which controls expression of genes involved in the inflammatory response.
In addition to their antioxidant effects, anthocyanins have been reported to suppress lipid peroxidation, stabilize DNA, modify adipocyte gene expression, improve insulin secretion and sensitivity, and have anti-carcinogenic, anti-inflammatory, and antibacterial effects. In in vivo studies, bilberries activated AMPK (AMP-activated protein kinase) in the white adipose tissue and skeletal muscle in diabetic mice; this activation induced upregulation of GLUT4 and enhancement of glucose uptake and utilization in these tissues without using insulin.
Aside from other phenolic compounds, the main phenolic constituent — anthocyanins — is further connected to reported beneficial health effects such as lowering blood glucose, anti-inflammatory and lipid-lowering effects, as well as promotion of antioxidant defense and reduction of oxidative stress. As anthocyanins are absorbed intact across the gastrointestinal tract, concentrations that reach human plasma after oral consumption may have vasoprotective properties.
The potential benefits of bilberry for mood and cognition are thought to be mediated through its diverse bioactive profile, which may influence key molecular pathways, including modulation of gamma-aminobutyric acid (GABA) metabolism, inhibition of monoamine oxidase (MAO) activity, regulation of acetylcholine levels, and enhancement of antioxidant defenses. Such effects are directly linked to the polyphenolic content of bilberry, which can mitigate oxidative stress, support neurotransmitter balance, and promote neuronal survival; nevertheless, the precise mechanisms underlying its neuroprotective and mood-enhancing properties remain insufficiently characterized.
The absorption of anthocyanins, either as intact glycosides or as aglycones, is low in the small intestine. The unabsorbed anthocyanins are converted by the action of gut microbiota to phenolic acids, which are further absorbed into the circulation. The metabolites of anthocyanins modulate the gut microbiota and production of short-chain fatty acids. After ingestion, only a small proportion is absorbed in the stomach, with absorption rates varying by chemical structure and molecular weight; this variation is primarily due to differences in glycosidic moieties attached to the anthocyanin molecules, and monoglucoside anthocyanins can achieve absorption rates of up to 25%, whereas other forms exhibit much lower rates (around 1%).
The night vision claim is the most historically prominent health claim for bilberry and the most rigorously evaluated. Searches of the literature identified 30 trials testing the effect of V. myrtillus anthocyanosides on human vision under reduced light conditions; many of these trials dated from the 1960s (n=15), 1970s (n=3), or 1980s (n=6). The four most recent trials were all randomized controlled trials (RCTs) and were negative in outcome. A fifth RCT and seven non-randomized controlled trials reported positive effects on outcome measures relevant to night vision.
Studies using relatively low doses of standardized anthocyanins (12–150 mg daily) did not prove any beneficial effects; studies with higher doses (up to 720 mg/day) showed beneficial effects in some measured aspects of night vision, but never enough to conclude the study as successful. One study used 40 military pilots as test subjects given 400 mg bilberry anthocyanins before flight; subjects reported reduced and shorter-lived post-dazzling after-images and reduced subjective visual fatigue, but there was no difference in objective ophthalmological values.
Overall, the systematic review of the available clinical studies published in 2004 shows that the extract does not improve night vision in healthy eyes, but there is a serious lack of rigorous clinical trials in patients with impaired night vision or diagnosed eye disease. Evidence from methodologically weaker trials and auxiliary evidence from animal studies, trials of synthetic anthocyanosides, and a randomized controlled trial of Ribes nigrum (black currant) anthocyanosides may warrant further trials of bilberry anthocyanosides in subjects with impaired night vision.
In a double-blind, randomized, placebo-controlled trial, supplementation of 240 mg of standardized bilberry extract daily for 12 weeks significantly improved the tonic accommodation of the ciliary muscle during near-vision tasks on display terminals, and therefore alleviated ocular fatigue symptoms. A Japanese study tested bilberry extract on nearly 300 screen users aged 20–40, with one group given 480 mg of bilberry extract daily for 8 weeks. This area of research — eye fatigue in display terminal workers — currently has more consistent positive signals than the night vision literature, though sample sizes remain modest.
Eating bilberry fruit containing a high amount of anthocyanoside seems to improve retina problems associated with diabetes or high blood pressure. A combination of two phenolic extracts from bilberry (standardized to 36% anthocyanins) and French maritime pine bark (standardized to 70% procyanidins) lowered elevated intraocular pressure in patients almost as effectively as latanoprost, however it took much longer. Evidence for retinopathy and intraocular pressure remains preliminary, with most data from small or uncontrolled studies. Animal model data are more robust: after administration of bilberry anthocyanin extract (BAE) at dosages of 250 and 500 mg/kg/day in an animal retinal degeneration model, retinal dysfunction was significantly inhibited and the decreased thicknesses of retinal layers were suppressed in rabbits with retinal degeneration.
Early research suggests that taking bilberry extract that contains 173 mg of anthocyanins daily for 30 days reduces symptoms associated with chronic venous insufficiency (CVI); other research suggests that taking 100–480 mg of bilberry anthocyanins daily for up to 6 months might improve swelling, pain, bruising, and burning associated with CVI. Clinical trials have shown that bilberry supplementation in patients with CVI induced increases in flexibility of the capillaries, restored normal blood flow, and improved core symptoms such as cramps, heaviness, and swelling of the calf and ankle. Older studies reviewed in the EMA assessment report show positive results, such as reduction of the number of petechiae on the skin of 27 patients with capillary fragility who took 80–120 mg of bilberry anthocyanosides.
One clinical trial found decreased levels of plasma inflammatory biomarkers in subjects taking bilberry juice for four weeks, with notable decreases in high-sensitivity C-reactive protein (hsCRP), a biomarker of subclinical inflammation and a predictor of CVD, as well as decreased levels of the pro-inflammatory cytokine interleukin-6 (IL-6). Another study found that subjects taking 100 g of whole bilberries daily improved platelet function, blood pressure, and high-density lipoprotein (HDL)-cholesterol levels.
Long-term supplementation with bilberry and grape seed extract was shown to improve systolic and diastolic blood pressure in individuals at risk of type 2 diabetes mellitus in the PRECISE study, a double-blind, placebo-controlled, cross-over intervention; however, main limitations of this study were the small number of participants, the unequal ratio of females and males, and the fact that the study was not powered for assessing impacts on blood pressure as this was not a primary outcome.
Although the potential value of bilberry in the treatment or prevention of conditions associated with inflammation, dyslipidemia, diabetes, and CVD has been recognized, strong evidence from controlled human supplementation studies in type 2 diabetes patients is lacking, and data from in vitro studies and animal studies cannot always be extrapolated to the clinical setting.
In an acute crossover design study, supplementation with bilberry extract resulted in a lower incremental plasma glucose and insulin (assessed by OGTT) when compared to consuming the placebo. The dietary anthocyanin consumption has been associated with a 15% reduction of type 2 diabetes (T2DM) risk in a large meta-analysis. However, extrapolating from dietary anthocyanin intake broadly to bilberry-specific effects requires caution. Contradictory clinical results exist for the use of bilberry fruits for T2DM; improvement in some measured clinical parameters might be attributed to the general antioxidant and anti-inflammatory effects of the bilberry phenolics, but in the majority of performed clinical trials there seems to be no specific benefit against T2DM, despite the fact that in vitro antidiabetic activities have been described for several isolated bilberry phenolic compounds.
During animal experiments in the 19th and early 20th century, researchers observed various degrees of urinary and blood sugar decrease after pre-prandial administration of bilberry leaf teas or extracts, but some observed no effects.
Open-label, pilot studies have been conducted in patients with mild to moderate colitis and with diarrhea-associated irritable bowel syndrome; the majority of patients consuming anthocyanin-rich bilberry extract showed a positive response, however, these studies need to be confirmed using blind, randomized, controlled protocols. Bilberry contains chemicals called tannins that can help improve diarrhea, as well as mouth and throat irritation, by reducing inflammation. This gastrointestinal use is one of the oldest historically documented applications and is acknowledged in the EMA traditional-use monograph for dried bilberry fruit.
Studies in older adults consuming anthocyanin-rich berry juices (including bilberry or blueberry) have shown improvements in memory, learning, and verbal fluency; animal studies also suggest cognitive benefits, with mechanisms likely involving reduced neuroinflammation, improved cerebral blood flow, and protection against oxidative stress. In a more specific intervention, a 24-week, randomised, double-blind, placebo-controlled trial (n=99) investigated the effects of anthocyanin supplementation on gut microbiota and cognition in older adults (60–80 years) at risk of cognitive decline due to mild cognitive impairment or cardiometabolic disorders. Cognitive performance, measured by episodic memory, was unaffected, and microbial shifts did not mediate intervention effects. Evidence in this domain thus remains preliminary, with the most relevant human trials not yet specifically targeting bilberry anthocyanins in isolation, and results to date being mixed.
Rapidly accumulating in vitro and in vivo evidence indicates that anthocyanins have cancer preventive and anti-cancer activity; bilberry anthocyanins were shown to be effective cancer preventive agents in 25 colorectal cancer patients in one study. Laboratory and clinical research evidence indicates that anthocyanins exhibit anticancer activity; it has been demonstrated that anthocyanins upregulate tumor suppressor genes, induce apoptosis in cancer cells, repair and protect genomic DNA integrity, and improve neuronal and cognitive brain function. This area of research is predominantly preclinical; robust human clinical trials specifically using bilberry for cancer prevention or treatment are not yet available.
Overall, the three most referenced indications — type 2 diabetes mellitus, vision disorders, and circulatory diseases — all include contradictory results with no clear conclusion as to the benefits and recommended dosages. Beneficial clinical results have been attested for the treatment of dyslipidemia and chronic inflammatory disorders when applied as dietary supplementation of fresh bilberries or as anthocyanin-rich bilberry fruit extracts; however, there is a general lack of double-blinded controlled research with larger sample sizes.
Bilberry extracts are available as capsules and tablets of varying concentrations, ranging from 40 to 1,000 mg; the typical dose varies greatly from 80 to 1,000 mg once or twice daily.
The following dosages are drawn from specific study protocols and official monographs as reported in the sources:
Bilberry is classified as a Class 1 herb by the American Herbal Products Association, meaning it can be safely consumed when used appropriately. No mutagenic activity has been reported, and there are no cited contraindications to its use. Bilberry fruit is generally thought to be safe when consumed in amounts typically found in foods, or at recommended doses for up to 1 year.
Neither fresh bilberries nor fruit or plant extracts have been implicated in causing serum enzyme elevations during treatment or clinically apparent acute liver injury. The LiverTox database assigns bilberry a likelihood score of E — unlikely cause of clinically apparent liver injury.
Prolonged use or high doses of the leaf can cause toxic side effects and should be avoided. The safety profile of the leaf preparation is considered significantly different from that of the berry or berry extract; leaf extracts warrant more caution regarding duration and dose.
Bilberry demonstrates minimal effect on drug metabolism but may affect platelet aggregation and predispose to excessive bleeding in patients on anticoagulants such as warfarin. Bilberry can increase the levels of blood-thinning medications or anticoagulants (e.g., clopidogrel, aspirin) and increase the risk of bleeding or bruising. Herbs with anticoagulant/antiplatelet properties may enhance the adverse or toxic effects of anticoagulant drugs; bleeding may occur and therapy modification should be considered.
Bilberry can cause blood sugar levels to decrease and lead to low blood sugar episodes, particularly if diabetes medications (e.g., metformin) are also being taken.
Surgery is identified as a primary consideration — bilberry should be stopped at least 2 weeks before any scheduled surgical procedure, allowing bilberry's antiplatelet effects to fully reverse and reducing perioperative bleeding risk.
Little is known about whether it is safe to use bilberry in amounts greater than those found in foods during pregnancy or while breastfeeding.
Herbal supplements containing bilberry extracts are not subject to detailed quality control due to generally lax legislation; although the quality specifications for bilberries are regulated by three monographs of the European Pharmacopoeia, herbal supplements do not have to comply with pharmacopoeial requirements. Storage and processing of the fresh berries leads to degradation of anthocyanin content, and variations in bioavailability have been observed.
Health conditions that Bilberry may help support.
Bilberry (Vaccinium myrtillus) is exceptionally rich in anthocyanins—particularly delphinidins and cyanidins—which are well-documented antioxidant compounds. Preclinical and in vitro evidence consistently shows these anthocyanins scavenge reactive oxygen species (ROS), inhibit lipid peroxidation, and upregulate endogenous antioxidant enzymes such as superoxide dismutase (SOD), catalase, and glutathione. Human clinical evidence is more limited and mixed, with at least one controlled trial finding no significant change in oxidative stress biomarkers, though a 2025 narrative review of human and lab studies supports moderate antioxidant benefits at 80–320 mg/day of anthocyanin-rich extracts. The evidence base is stronger at the mechanistic and preclinical level than at the clinical level.
Bilberry (Vaccinium myrtillus) is exceptionally rich in anthocyanins including delphinidin, malvidin, and cyanidin glycosides with documented endothelial-protective effects. A JAMA Internal Medicine RCT showed bilberry and blackcurrant anthocyanins (320 mg/day, 16 weeks) improved FMD and reduced VCAM-1 in obese subjects. Life Extension's cardiovascular protocol cited bilberry among anti-atherogenic berry polyphenols.
Bilberry has documented antiplatelet and anticoagulant-potentiating properties. It inhibits platelet aggregation and may increase prothrombin time and partial thromboplastin time. These effects are clinically significant enough that Memorial Sloan Kettering and Drugs.com warn of potential bleeding interactions with anticoagulant and antiplatelet medications.
A double-blind, placebo-controlled crossover RCT (PRECISE study) found that 12-week supplementation with bilberry plus grape seed extract decreased ambulatory systolic and diastolic blood pressure by 4.7 and 2.3 mmHg respectively. A single-blind RCT also showed bilberry consumption reduced systolic blood pressure in subjects with cardiovascular risk factors.
Both bilberry fruit and leaf preparations have been studied for glycemic effects in human trials. A clinical study demonstrated that a standardized bilberry extract (36% anthocyanins) reduced postprandial glycemia and insulin in type 2 diabetes patients. A systematic review found bilberry and blackcurrant extract lowered HbA1c, particularly in older Chinese T2DM subjects in longer-term studies. Overall evidence is promising but not yet conclusive.
Clinical studies show bilberry/blackcurrant anthocyanin supplementation can reduce total and LDL cholesterol and increase HDL in subjects with hypercholesterolemia, metabolic syndrome, or T2DM. Results are inconsistent across trials; a 52-participant RCT with isolated bilberry anthocyanins found no lipid effects at 28 days.
Bilberry anthocyanins modulate key inflammatory pathways including NF-κB, TNF-α, IL-6, and IL-1β in both preclinical and human studies. Clinical trials in metabolic disorders and UC patients show reductions in inflammatory markers with bilberry supplementation. A 2022 PMC review concluded bilberry may be useful in the prevention and treatment of chronic inflammatory disorders.
Bilberry (Vaccinium myrtillus) is rich in anthocyanins, which have been shown to improve microcirculation, strengthen capillary walls, reduce capillary fragility, and support venous health in clinical trials. Studies report benefits in chronic venous insufficiency and diabetic retinopathy, both conditions of compromised vascular function. Bilberry anthocyanins have antioxidant and vasoprotective effects on endothelial cells.
An open prospective pilot trial in 13 UC patients treated with anthocyanin-rich bilberry for 6 weeks achieved remission in 63.4% and response in 90.9%, with significant reductions in endoscopic and biochemical disease activity. A follow-up molecular study confirmed reduced IFN-γ and TNF-α in colon biopsies of responders. Evidence is preliminary but is the first human data.
Bilberry anthocyanosides cross-link collagen fibers, inhibit enzymatic and non-enzymatic collagen degradation, and protect collagen from free-radical damage in vitro. These mechanisms underpin traditional and clinical use for conditions involving connective tissue integrity. Human clinical evidence is mostly indirect, via vascular and capillary endpoints.
Bilberry (Vaccinium myrtillus) anthocyanins have been studied in clinical RCTs for dry eye, with a 3-month pilot RCT (n=24, 600 mg bilberry + fish oil) showing improvements in OSDI, NITBUT, tear secretion, and meibomian gland openings. A separate RCT found 160 mg bilberry extract for 4 weeks improved tear volume by Schirmer test. Anti-inflammatory and vasoprotective anthocyanins reduce oxidative stress on the ocular surface.
Bilberry (Vaccinium myrtillus) anthocyanins have been studied in multiple RCTs for VDT-induced eye fatigue. A 2015 PubMed-indexed RCT (n=281 office workers, 480 mg/day bilberry extract, 8 weeks) evaluated critical flicker fusion, near point accommodation, and subjective eye fatigue symptoms. A 2020 PMC-published RCT (n=109, 240 mg/day standardized bilberry extract, 12 weeks) demonstrated improvement in ciliary muscle tonic accommodation after VDT tasks. Anthocyanins may penetrate to the ciliary muscle and relieve tension.
Bilberry (Vaccinium myrtillus) is rich in anthocyanosides that enhance rhodopsin regeneration in retinal rod cells and support retinal microcirculation and antioxidant defense. A 2015 Japanese RCT (n=88) found 480 mg/day bilberry extract significantly reduced eye fatigue and improved visual accommodation in VDT workers. A 2017 RCT found standardized bilberry extract (Mirtoselect®) improved dry eye symptoms.
Bilberry anthocyanins are extensively studied for glaucoma and ocular vascular health. Clinical evidence shows bilberry extract reduces intraocular pressure, increases ocular blood flow, and improves visual field outcomes. It is commonly combined with pine bark extract (as Mirtogenol) in clinical trials demonstrating IOP reduction in ocular hypertensive patients.
Bilberry's anthocyanins are potent antioxidants that combat free-radical-associated tissue damage linked to aging. A 2024 RCT found fermented bilberry extract significantly improved skin firmness, wrinkle depth, skin elasticity, and antioxidant capacity over 84 days. A clinical trial in aged men also showed reductions in plasma inflammation and tissue damage biomarkers.
Bilberry (Vaccinium myrtillus) is rich in anthocyanosides that protect retinal capillaries and ocular tissues from oxidative stress relevant to age-related vision decline. Small clinical studies report improvements in visual acuity and contrast sensitivity in AMD patients, and prevention of lens and retinal impairments. Traditional use in European herbal medicine for eye conditions dates back centuries.
Clinical trials show bilberry supplementation improves exercise capacity, reduces oxidized LDL, and beneficially modulates cardiovascular risk factors including HDL cholesterol and endothelial function. An open-label RCT post-myocardial infarction found significant improvements in 6-minute walk test distance and oxidized LDL. Larger confirmatory trials are ongoing.
Human pilot clinical data show that anthocyanin-rich bilberry preparation significantly reduced disease activity, fecal calprotectin, and mucosal inflammation in mild-to-moderate UC over 6 weeks. Molecular studies confirm modulation of NF-κB, IFN-γ, and TNF-α signaling in colonic tissue of treated patients. Evidence is preliminary but derives from human clinical data.
Bilberry anthocyanins activate AMPK in key insulin-sensitive tissues (adipose, muscle, liver), upregulate GLUT4, and suppress hepatic glucose output in animal models. Human clinical data include a crossover trial showing reduced postprandial glucose and insulin in T2DM. Long-term HbA1c improvements have been reported in systematic review data for certain populations.
Bilberry (Vaccinium myrtillus) is rich in anthocyanins with potent antioxidant, anti-inflammatory, and vascular-protective properties. Animal studies (OXYS rat model) demonstrated bilberry extract prevented macular degeneration and cataracts. A 2024 PMC review confirmed preclinical evidence that bilberry anthocyanins improve retinal health by reducing oxidative stress and inflammation relevant to AMD progression, though large-scale human RCTs are limited.
Bilberry supplementation has been studied across multiple components of metabolic syndrome including hyperglycemia, dyslipidemia, hypertension, inflammation, and oxidative stress. A systematic review found bilberry/blackcurrant improved HbA1c and cholesterol in subjects with metabolic syndrome. Its anthocyanins address several simultaneous metabolic syndrome risk factors.
A 2024 double-blind, placebo-controlled RCT demonstrated that fermented bilberry extract taken orally for 84 days significantly improved skin firmness, elasticity, wrinkle depth, and skin antioxidant capacity. Anthocyanosides also stabilize and stimulate collagen synthesis in vitro. This is the first robust human trial specifically targeting skin structural outcomes.
Bilberry (Vaccinium myrtillus) is traditionally and scientifically used for vascular conditions including spider veins and varicose veins. Its anthocyanins have documented direct vasoactive and vasoprotective properties in peer-reviewed research. Bilberry anthocyanins strengthen capillary walls and reduce vascular permeability relevant to telangiectasias.
Some human intervention studies report reductions in blood triglycerides with bilberry or bilberry/blackcurrant anthocyanin supplementation, particularly in subjects with dyslipidemia or metabolic syndrome. Results are inconsistent across trials, with a 52-participant double-blind RCT finding no significant triglyceride change with isolated bilberry anthocyanins over 28 days.
Bilberry (Vaccinium myrtillus) contains anthocyanosides and proanthocyanidins that, due to their similarity to OPCs from grape seed and pine bark, have been recommended for varicose veins. Its anthocyanosides have demonstrated vasoactive and vasoprotective properties (Bell & Gochenaur 2006) and collagen-stabilizing actions relevant to vessel wall integrity. It is included in EBSCO's evidence summary for varicose vein–associated conditions, though robust dedicated CVI clinical trials are limited.
Bilberry (Vaccinium myrtillus) has traditional use in European medicine for diarrhea, attributed to its high tannin content and astringent properties. NIH/LiverTox notes that in traditional medicine, bilberry was used to treat diarrhea and gastrointestinal complaints. Scientific clinical evidence for bilberry specifically for diarrhea is limited.
Bilberry (Vaccinium myrtillus) has a long history of traditional use in European herbal medicine for vascular conditions including hemorrhoids. Rich in anthocyanins, it is listed by EBSCO Research Starters as a principal proposed natural treatment for hemorrhoids. It was incorporated in a 2021 PMC retrospective study compound that achieved 89.8% grade reduction in hemorrhoid severity.
Bilberry has a documented European traditional use for gut inflammation, diarrhea, and gastrointestinal upset that encompasses symptoms overlapping with IBS. The tannin content is considered relevant to bowel-regulating effects. No specific controlled clinical trials in IBS populations have been identified.
Bilberry (Vaccinium myrtillus) has a long traditional association with night vision improvement, famously linked to WWII British Royal Air Force pilots who consumed bilberry jam before night raids. Its anthocyanosides were proposed to accelerate rhodopsin regeneration. However, a systematic review of 12 placebo-controlled trials found that the most rigorous RCTs did not support benefit for night vision in subjects with normal eyesight.
Bilberry (Vaccinium myrtillus) contains anthocyanosides proposed to strengthen nasal capillaries by protecting collagen, offering a rationale for reducing recurrent nosebleeds due to capillary fragility. Complementary medicine references list it among proposed natural treatments for epistaxis, though no clinical trials have directly evaluated it for this indication.
Body systems that Bilberry may help support.
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