Bilberry: Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

What is Bilberry?

Bilberry (Vaccinium myrtillus) is a small, dark-blue berry related to the blueberry, native to Europe. It is high in anthocyanins, the deep-purple antioxidant pigments also found in blueberries and blackberries. Its popularity for eye health traces back to a Second World War story that British pilots ate bilberry jam to improve their night vision — a tale now widely regarded as wartime propaganda rather than science. As a supplement it comes as dried berry, juice and standardised extracts.

What Bilberry is commonly used for

In supplements, Bilberry is most often included for brain & memory support support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.

How Bilberry works

Anthocyanins are antioxidants that neutralise reactive molecules and may support small blood vessels. The proposed eye benefits are based on the idea that improved microcirculation and antioxidant protection could help the retina. While the mechanism is plausible and bilberry is a healthy food, plausibility is not the same as proven benefit — and well-designed human trials for the marketed vision claims are limited and largely unconvincing.

What the evidence says

Here's an honest snapshot of what published research suggests about Bilberry — including where the evidence is limited.

• Reviews of controlled studies have generally not found convincing evidence that bilberry improves night vision or normal eyesight, despite its marketing. (PubMed research)
• As an anthocyanin-rich food, bilberry has antioxidant properties, and small studies have explored effects on circulation and eye comfort, but the evidence remains preliminary. (PubMed research)

Typical dosage used in studies

Extracts standardised to anthocyanins (often around 25%) have been used at roughly 80-480 mg/day in studies, but because the evidence for benefit is weak, no dose is well established. This is research information, not a recommendation.

Side effects and safety

Bilberry as a food is very safe, and standardised extracts are generally well tolerated in short-term use. Long-term safety of concentrated extracts is less well studied. In theory, high doses could affect blood sugar or blood clotting.

Medication interactions and who should avoid Bilberry

Sources & further reading

The evidence summary above is drawn from these sources. For general, authoritative background you can also consult:

• PubMed research
• PubMed research
• NIH Office of Dietary Supplements
• NIH National Center for Complementary and Integrative Health
• MedlinePlus (U.S. National Library of Medicine)

Frequently asked questions

Does bilberry improve your eyesight?

The famous night-vision claim comes from a wartime myth, and good human trials have not convincingly shown that bilberry improves normal vision or night vision.

Is bilberry the same as blueberry?

They're close relatives. Bilberry is the smaller European species with more intense pigment throughout the flesh; both are anthocyanin-rich.

What is bilberry actually good for?

It's a healthy, antioxidant-rich berry, but the specific supplement claims — especially for eyes — aren't well supported. Treat marketing claims sceptically.

Is bilberry safe?

As a food, very safe. Concentrated extracts are generally well tolerated short-term, with limited long-term data.

Should I take bilberry for my eyes?

If you have vision concerns, see an eye-care professional. Bilberry is not a proven treatment for any eye condition.