Bilberry
Also known as: Vaccinium myrtillus, European blueberry, Whortleberry
The anthocyanin-rich wild blueberry — night-vision folklore meets real eye-vessel and circulation evidence.
In short
Bilberry (Vaccinium myrtillus) is the wild European blueberry, and its deep color comes from anthocyanins — the same pigment family studied in eye health and circulation. The famous story that RAF pilots ate bilberry jam for night vision is mostly folklore, but the underlying science is real: anthocyanins support retinal microcirculation and visual adaptation, and trials (mostly with anthocyanin-rich bilberry extracts) show improved visual function in eye-fatigue contexts and support for microvascular health. It is also used for venous insufficiency and mild glucose support. It is very safe, with the main caution being interaction with anticoagulants at high doses.
- Wild European blueberry; anthocyanin-rich
- Night-vision folklore: overstated; microcirculation evidence: real
- Trials: visual fatigue, venous function, mild glucose effects
- Very safe; anticoagulant caution at high doses
What is Bilberry?
Bilberry owns supplement lore's most charming myth — wartime pilots eating bilberry jam for night vision — and beneath the story sits a legitimate, anthocyanin-rich fruit with real effects on microcirculation. The honest evidence base: visual fatigue improves in trials using bilberry-derived anthocyanins, venous function responds to the same pigments, and the retina's dense vasculature is a plausible target for their action. The night-vision claim was marketing, but the berry it rode in on earned its keep.
Where it comes from
Natural sources
- Berries of Vaccinium myrtillus, native to northern Europe
- Anthocyanins (25+ identified) plus resveratrol and quercetin
- Traditional European remedy for diarrhea, mouth sores, and eye strain
How it's made
Standardized extracts (typically 25–36% anthocyanins), 80–480 mg/day.
What it does in products
Benefits
Visual fatigue and function
moderate evidenceTrials of anthocyanin-rich extracts report improved visual adaptation and reduced eye strain, particularly in screen-work contexts.
Venous and capillary support
moderate evidenceStudies show reduced symptoms of venous insufficiency and improved capillary fragility — consistent with anthocyanin venotonic effects.
Metabolic support
emerging evidenceAnthocyanins modestly influence glucose handling in some trials; evidence is supportive but secondary to the eye and vein data.
Side effects & safety
Safety considerations
- Dietary consumption is safe; concentrated extracts lack specific pregnancy data.
- Anticoagulants/antiplatelets — mild additive effects at high doses.
- Not for: None significant
How it's used
In supplements
80–480 mg/day of standardized extract (25–36% anthocyanins); visual-fatigue trials commonly used 240–480 mg/day.
In skincare
Anthocyanin extracts appear in antioxidant cosmetics; no standard concentration.
Regulatory status
- Sold as a dietary supplement; no FDA-approved disease claims.
- GRAS (generally recognized as safe) for food use.
- Not applicable.
Popular products containing Bilberry
- Swanson Bilberry Extract — Standardized anthocyanin capsulesSwanson · Supplement
- Life Extension Bilberry Extract — 100 mg 25% anthocyaninsLife Extension · Supplement
- Now Foods Bilberry Complex — Bilberry with lutein blendsNOW Foods · Supplement
Product names and brands are shown for reference and belong to their respective owners.
The RAF myth, sorted
The story — pilots eating bilberry jam to sharpen night vision — traces to wartime anecdotes with no solid documentation. What is documented is anthocyanin biology: these pigments concentrate in ocular tissue, improve retinal blood flow, and regenerate rhodopsin-adjacent processes in some models. The myth overpromised; the microcirculation science delivered something real.
Where the trials concentrate
Modern evidence clusters around visual fatigue (screen workers, low-light adaptation) and venous insufficiency, where bilberry anthocyanins show consistent, modest effects. Eye-fatigue trials are the most commercially relevant and the most replicated.
Frequently asked questions
Is bilberry the same as blueberry?
Related but different — bilberry (Vaccinium myrtillus) is the wild European species with dark flesh throughout; cultivated blueberries have pale flesh and generally lower anthocyanin density.
Does bilberry improve night vision?
The dramatic wartime claims are unsupported, but anthocyanin-rich extracts do improve visual adaptation and reduce eye fatigue in modern trials.
Can I take bilberry with blood thinners?
At high doses anthocyanins mildly affect platelets. Discuss with your prescriber; food amounts are not a concern.
The bottom line
Bilberry is a genuinely useful anthocyanin source for visual fatigue and microcirculation — the myth was marketing, but the berry's biochemistry backed into the truth.
References
- Bilberry anthocyanins and visual function. PubMed Central. https://pubmed.ncbi.nlm.nih.gov/31243089/
- Bilberry in venous insufficiency. PubMed. https://pubmed.ncbi.nlm.nih.gov/21683404/
- Anthocyanins and eye health: review. PubMed. https://pubmed.ncbi.nlm.nih.gov/31535766/