Bilberry
A berry famous for night-vision lore — careful trials haven't backed it up, though it's rich in anthocyanins.
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What it is
Bilberry is a small, dark blue berry native to Europe and closely related to the blueberry. Supplements are usually extracts standardized to anthocyanins, the purple-blue pigments in the fruit.
How it works
Bilberries are rich in anthocyanins, antioxidant pigments that in lab and animal studies may support small blood vessels in the eye and help regenerate rhodopsin, the light-sensitive pigment used for night vision. These effects haven't translated into reliable improvements in night vision in well-controlled human trials. Anthocyanins are also poorly absorbed and quickly broken down, which may help explain the gap between lab promise and human results.
What it's been studied for
Commonly taken for night vision, eye strain, and general eye health, and sometimes for circulation.
What the evidence shows
Weak. A systematic review of placebo-controlled trials found that the more rigorous studies showed no benefit for night vision, with positive results coming mainly from weaker studies. A few small recent trials suggest possible help with screen-related eye fatigue, but these need confirmation — the famous claims rest largely on older, poorly controlled research.
Who should consider it
People who enjoy bilberries or want an anthocyanin-rich food can simply eat them. Those hoping for sharper night vision are unlikely to notice a difference, based on the better-designed studies. Changes in vision — including new trouble seeing at night — deserve an eye exam, since causes like cataracts, retinal conditions, or vitamin A deficiency need proper care.
Amounts commonly studied
Studies commonly used standardized fruit extracts at roughly 160 to 480 mg per day.
How to take it
Studies commonly used standardized extracts of about 160 to 480 mg per day, often divided and taken with meals, for several weeks to a few months. If you take blood thinners or diabetes medicines, or have surgery coming up, talk to your provider first.
Forms & absorption
Standardized fruit extracts in capsules are the studied form; dried berries, juice, and jam provide anthocyanins too, in variable amounts. Anthocyanins are absorbed in small amounts and broken down quickly, which may limit their effects.
Food sources
Fresh or frozen bilberries, bilberry jam, and juice; blueberries, blackcurrants, and other dark berries provide similar anthocyanins in different amounts and mixes.
Safety & interactions
Bilberry fruit and extracts are generally well tolerated; mild digestive upset is possible. Anthocyanins may mildly reduce platelet clumping, so there's a theoretical added bleeding risk with blood thinners or antiplatelet drugs such as warfarin, clopidogrel, or aspirin — tell your provider, and your surgeon before any procedure. Bilberry leaf (as opposed to the fruit) isn't recommended in high doses or for long periods and may lower blood sugar, and safety data in pregnancy and breastfeeding are limited.
Myths & what it won't do
Myth: British WWII pilots proved bilberries improve night vision. Reality: the story is widely considered wartime legend, possibly a cover for radar, and controlled trials haven't confirmed a night-vision benefit. Myth: bilberry can protect against or reverse eye diseases like macular degeneration. Reality: there's no good human evidence for this, and eye diseases need evaluation and care from an eye doctor.
Common questions
- Will bilberry improve my night vision?
- Probably not. A systematic review found that the more rigorous placebo-controlled trials showed no meaningful benefit. If your night vision is getting worse, an eye exam is the right next step.
- Is bilberry the same as blueberry?
- They're close relatives. Bilberries are smaller and darker, with pigment through the flesh rather than just the skin, so they tend to be richer in anthocyanins than common cultivated blueberries.
- Does it help with eye strain from screens?
- A few small trials suggest possible improvements in eye fatigue, but the research is early. Regular screen breaks, good lighting, and an up-to-date prescription are more reliable first steps.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Bilberry
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- Canter PH, Ernst E. Anthocyanosides of Vaccinium myrtillus (bilberry) for night vision — a systematic review of placebo-controlled trials. Surv Ophthalmol. 2004;49(1):38-50. View study →Note: The more rigorous placebo-controlled trials found no benefit for night vision; positive results came from weaker studies.
- Ozawa Y, Kawashima M, Inoue S, et al. Bilberry extract supplementation for preventing eye fatigue in video display terminal workers. J Nutr Health Aging. 2015;19(5):548-554. View study →Note: In office workers, 8 weeks of bilberry extract eased some measures of screen-related eye fatigue.