Antioxidant ·Moderate evidence ·Reviewed May 2026
Bilberry (Vaccinium myrtillus) is a wild European berry whose dark pigment is rich in anthocyanins, a class of water-soluble flavonoid polyphenols. Standardized extracts are typically concentrated to 25 to 36 percent anthocyanosides and are marketed primarily for eye and retinal health, capillary integrity, and general antioxidant support. The evidence for systemic antioxidant and microvascular effects is moderate, while popular claims for sharpening night vision in healthy people are weak.
The bottom line
Evidence rating moderate. Most-documented uses: antioxidant protection against oxidative stress, support for retinal and eye health, improved capillary strength and microcirculation. 10 sources indexed (2004–2020), with 5 interaction records on file.
Core mechanism
Anthocyanins are polyphenolic flavonoids that scavenge reactive oxygen species and chelate transition metals, reducing oxidative stress and lipid peroxidation. In vascular tissue they appear to support endothelial function and capillary integrity, in part by inhibiting collagen-degrading enzymes and stabilizing the extracellular matrix, and by modulating nitric oxide signaling. In the eye, bilberry anthocyanins are proposed to support microcirculation in the retina and to aid regeneration of rhodopsin in rod photoreceptors, though clinical confirmation of the rhodopsin effect is limited. They also modulate inflammatory signaling pathways such as NF-kB and influence enzymes involved in glucose and lipid handling.1,7
Anthocyanins are water-soluble and have generally low and variable oral bioavailability, with plasma levels peaking within 1 to 2 hours. Taking with food may improve tolerability and modestly aid absorption. Standardized extracts provide a more consistent anthocyanin dose than whole-berry products.2,3
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Standardized 25% anthocyanin extract (capsule/tablet).
Pricing reflects a daily dose delivering roughly 80 to 160 mg anthocyanins (commonly 320 to 640 mg of 25% extract). Budget tier is generic non-clinically-branded extract; premium reflects branded, well-characterized extracts (such as 36% anthocyanidin Mirtoselect-type) and tighter standardization. Per-dose cost is sensitive to the labeled standardization percentage, so compare on anthocyanin content rather than total extract milligrams. Updated 2026-06-04.
Dose: 80 to 160 mg anthocyanins per day (standardized extract)
Timing: Split into two doses, with meals
Bilberry anthocyanins are traditionally promoted for eye comfort and microcirculation. Evidence for night vision and dark adaptation in healthy people is weak and largely negative in controlled trials; modest benefits have been reported mainly for eye fatigue and dry-eye symptoms. Set expectations conservatively and do not treat it as a substitute for eye care.
Dose: 80 to 160 mg anthocyanins per day6,8
Timing: Split twice daily with food
Anthocyanins may support capillary integrity and venous tone; small studies suggest symptom relief in chronic venous insufficiency, though trials are limited and of modest quality. Benefits, if present, build over weeks rather than acutely.
Dose: 80 to 120 mg anthocyanins per day7
Timing: Once daily with a meal
Anthocyanins are potent in-vitro antioxidants, but plasma levels of intact compounds are very low and short-lived, so much of any effect is likely from phenolic metabolites and gut-level activity. Treat antioxidant claims cautiously; a varied diet rich in colorful berries provides similar compounds.
Dose: 120 to 160 mg anthocyanins per day
Timing: Split twice daily with meals
Some trials of berry anthocyanins report small improvements in postprandial glucose and lipid markers, but findings are inconsistent and bilberry-specific data are sparse. Consider supportive at best, not a replacement for diet, exercise, or prescribed glucose-lowering medication.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Bilberry anthocyanins are potent antioxidants that may support retinal microcirculation and protect retinal pigment epithelium from oxidative stress; small trials report modest reductions in subjective asthenopia (eye fatigue) during prolonged near work such as visual display terminal use.2,10
Benefit signals are mostly from small short-term studies on subjective symptoms; effects are modest and not a substitute for limiting screen time and addressing dry eye or refractive error.
Anthocyanins may improve capillary integrity and reduce vascular permeability and microvascular leakage, which has been used as a rationale for symptomatic relief in chronic venous insufficiency and related microcirculatory complaints.6,1
Evidence comes from older and generally lower-quality European trials; useful as adjunct symptom support only, not a replacement for compression therapy or medical evaluation.
Historically proposed to enhance rhodopsin regeneration in rod photoreceptors and improve dark adaptation, but well-controlled placebo trials in healthy people have largely failed to confirm a meaningful effect on scotopic vision.1,10
The famous World War II pilot night-vision story is anecdotal; rigorous trials do not support a reliable night-vision benefit in people with normal vision.
Anthocyanins scavenge free radicals and can upregulate endogenous antioxidant pathways such as Nrf2-driven enzyme expression, contributing to measurable shifts in some oxidative stress and inflammatory biomarkers.4,7
Biomarker changes do not reliably translate into proven clinical outcomes; treat as general antioxidant support within a polyphenol-rich diet.
Vitamin C and bilberry anthocyanins are complementary antioxidants. Ascorbate can help regenerate and stabilize flavonoid antioxidants, and the combination is commonly used to support capillary integrity and general antioxidant defense.
Recommendation: These can be taken together safely with food. No special separation is needed; combine within normal dietary or supplemental ranges.
Quercetin and bilberry anthocyanins are both flavonoids with overlapping antioxidant and vascular-stabilizing actions, and they are frequently combined for microcirculatory and capillary support.
Recommendation: Safe to combine with food at typical supplemental doses. Monitor for additive effects if also taking other antiplatelet or anticoagulant agents.
Both bilberry anthocyanins and high-dose fish oil can mildly reduce platelet aggregation. Taken together, and especially alongside anticoagulant or antiplatelet medication, they may have an additive effect on bleeding tendency.
Recommendation: Combining is generally fine for most people. Use caution at high doses, before surgery, or if on anticoagulants or antiplatelet drugs; discuss with a clinician in those situations and watch for easy bruising or prolonged bleeding.
Polyphenols including anthocyanins and other flavonoids can chelate non-heme iron in the gut and reduce its absorption when consumed together.
Recommendation: If iron repletion is a goal, separate the bilberry extract from the iron dose by about 2 hours. Taking iron with vitamin C and away from polyphenol-rich foods or supplements improves uptake.
Alpha-lipoic acid and bilberry anthocyanins are complementary antioxidants sometimes combined for microvascular and retinal support, particularly in the context of diabetic microcirculatory concerns.
Recommendation: Safe to combine at standard doses with food. If using either for blood sugar or diabetic complications, monitor glucose, as both have been studied in that setting.
Search all 5 interaction records for Anthocyanins (Bilberry Extract) →
Numbered references. Citations throughout the page link here.
A systematic review of placebo-controlled trials found no robust evidence that bilberry anthocyanins improve night vision in people with normal vision.
Daily bilberry extract reduced subjective eye fatigue measures compared with placebo in adults performing prolonged visual tasks.
Review summarizes preclinical and clinical data indicating antioxidant, anti-inflammatory, and microvascular-protective activity of bilberry anthocyanins.
Dietary and supplemental anthocyanins are associated with improved endothelial function and favorable cardiovascular risk markers in human studies.
Anthocyanins are among the least bioavailable polyphenols, with low plasma concentrations and rapid clearance after oral intake.
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