Evidence-based·Last reviewed May 30, 2026·How we grade evidence

bilberry

Botanical

Useful mainly for people with chronic venous insufficiency or capillary fragility wanting adjunct support.

Quick decision guide

May help most

people with chronic venous insufficiency or capillary fragility wanting adjunct support

Common dosing range

80–480 mg/day standardized extract (25% anthocyanosides), in divided doses

When to expect effects

Weeks

Watch out for

Concentrated extracts may add to bleeding risk with anticoagulants/antiplatelets

What is it

Bilberry (Vaccinium myrtillus) is a small, dark blue-purple berry related to the North American blueberry, found wild across northern Europe. Its fruit is rich in anthocyanin pigments and is used in supplements for eye, vascular, and circulatory health.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You have chronic venous insufficiency and want a low-risk adjunct
You have symptoms of capillary fragility
You tolerate it well and have realistic, modest expectations

Probably skip if…

You expect improved night vision — the evidence does not support it
You take anticoagulants or are near surgery
You want a substitute for proven retinopathy or vascular treatment

Evidence at a glance

night vision

Mixed Evidence
Effect
No reliable effect
Best fit
none demonstrated
Time
Not applicable

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

night vision

Supplement benefit
Mixed Evidence

Despite the popular WWII-pilot story, controlled trials of bilberry on night vision and dark adaptation have been largely negative. The evidence does not support a meaningful night-vision benefit.

Effect size
No reliable effect
Time to effect
Not applicable
Best fit
none demonstrated
Less likely
people seeking better dark adaptation or night driving

Bottom line: Bilberry does not reliably improve night vision.

Evidence is mixed

Early anecdotal reports were positive, but controlled studies of dark adaptation generally found no effect.

SourceCanter et al., 2004 — PubMed· conflictingKramer et al., 2004 — PubMed· conflicting
SourceCanter et al., 2004 — PubMedKramer et al., 2004 — PubMed

How it works

Bilberry's primary bioactive compounds are anthocyanins, the dark purple pigments that give the berries their color. Bilberry is particularly rich in these compounds, with concentrations several times higher than common blueberries. Anthocyanins are powerful antioxidants that may protect vascular endothelial cells and small blood vessels from oxidative damage. In the eye, bilberry anthocyanins are thought to support microcirculation in the retina and potentially affect the regeneration of rhodopsin, the visual pigment involved in night vision. This is the basis for the often-repeated (though largely anecdotal) claim that British WWII pilots ate bilberry jam to improve night vision. Modern clinical evidence for night vision benefits is mixed and generally underwhelming. Bilberry may also support venous and capillary integrity through effects on small blood vessels. Some preliminary research suggests benefits for chronic venous insufficiency and reduced capillary fragility. Antioxidant and anti-inflammatory effects may underlie broader vascular benefits, though clinical evidence varies by condition.

How to take it

1. Typical dose
80–480 mg/day standardized extract (25% anthocyanosides)
2. Timing
Divided morning and evening
3. With food
With food may aid absorption and reduce GI upset
4. Split dosing
Twice daily helps maintain anthocyanin exposure
5. How long to try
Trial several weeks for circulatory or visual goals

What to track

leg heaviness or swelling
visual comfort
bruising tendency

4 commercial forms

Compare the main delivery options and what they’re best suited for.

Standardized bilberry extract

Most common modern form. Provides concentrated anthocyanins for therapeutic applications.

Typically 25% anthocyanosides

Bilberry powder (dried fruit)

Whole-food form. Can be used in smoothies or as supplement filler.

Lower concentrated anthocyanin content

Fresh or frozen berries

Traditional form. Provides anthocyanins along with fiber and other nutrients.

Whole-food form; seasonal availability

Liquid extract

Used in tinctures and combination eye health products.

Alcohol or glycerin-based extraction

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

mild GI upsetlooser stools at high extract doses

Who should avoid it

  • people near surgery (stop ~2 weeks prior)
  • pregnant or breastfeeding women using high-dose extracts

Pregnancy & breastfeeding

Whole-food bilberry is generally fine, but high-dose extracts should be avoided in pregnancy and breastfeeding due to limited data.

Interactions

anticoagulants and antiplatelets (warfarin, aspirin)Moderate

mild antiplatelet effect may add to bleeding risk

NSAIDsMinor

possible additive bleeding tendency

antidiabetic drugsMinor

high doses may affect blood glucose; monitor

Protocols featuring bilberry

Evidence-backed routines where bilberry plays a role.

Eye Health & Digital Strain

focus

Adults spend 7-10 hours a day in front of screens — the highest digital exposure in human history. The symptoms (dry eyes, blurred vision, headache, fatigue, "computer vision syndrome") are real but the supplement category for them is over-marketed. The best-evidenced eye supplements come from age-related macular degeneration research, particularly the AREDS2 trial — lutein, zeaxanthin, omega-3, zinc, and vitamins C/E. Astaxanthin has emerging trial evidence specifically for digital eye strain and asthenopia. Bilberry is the most-marketed and least-evidenced. This stack supports general eye health plus the specific demands of high-screen-time lifestyles. It is not a substitute for regular eye exams or treating refractive errors with proper glasses or contact lenses.

Food sources

Fresh wild bilberries

Amount
1 cup (~100g)
%DV
—

Bilberry jam (traditional)

Amount
Variable anthocyanin content
%DV
—

Frozen bilberries (where available)

Amount
1 cup
%DV
—

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

standardized to 25% anthocyanosides
Vaccinium myrtillus identity (not generic blueberry)
stated extract ratio

Be skeptical of…

improves night vision
reverses eye disease
cures vascular disease

Frequently asked questions

Does bilberry really improve night vision?⌄

Despite the popular WWII pilot story, controlled trials have not consistently shown night vision benefits in healthy adults. The story is largely anecdotal. If you have night vision concerns, see an eye care professional.

Is bilberry the same as blueberry?⌄

They are related species in the same genus (Vaccinium), but bilberries are smaller, darker throughout (not just the skin), and contain higher concentrations of anthocyanins. They are not interchangeable for high-dose supplement effects.

How long until I notice effects?⌄

For most applications, daily use over 4 to 12 weeks is typical before judging effects. Short-term acute effects are minimal.

Is bilberry safe with blood thinners?⌄

Concentrated bilberry extracts may have mild antiplatelet effects. Use caution if you take warfarin, aspirin, or other antiplatelet medications, and discuss with your prescriber.

Can I just eat blueberries instead?⌄

Blueberries provide similar anthocyanin compounds but at lower concentrations than bilberries. Both contribute beneficial polyphenols to a healthy diet, but a clinical-trial-strength dose of bilberry compounds is hard to achieve from blueberries alone.

References by claim

night vision

Canter et al., 2004 — PubMed (2004) link

Kramer et al., 2004 — PubMed (2004) link

Track bilberry with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.