What is bilberry extract?

Bilberry extract is a supplement made from Vaccinium myrtillus berries and typically standardized for anthocyanin content. It is used for antioxidant support and eye and vascular health.

What are the main benefits of bilberry extract?

It is commonly used to support eye health and visual function and to provide antioxidant and anti-inflammatory support. It may also support circulation and healthy blood glucose in some people.

How much bilberry extract should I take?

Common supplemental amounts are about 160–480 mg per day, often based on standardized extracts. Follow the product label and consider medical advice if you have health conditions.

Can bilberry extract help with blood sugar?

Some evidence suggests it may support healthy fasting glucose and insulin sensitivity, but results are mixed. It should not replace prescribed diabetes medications or monitoring.

Who should be cautious with bilberry extract?

People taking blood thinners or antiplatelet drugs, those with bleeding disorders, and anyone preparing for surgery should use caution due to potential effects on bleeding risk. Pregnant or breastfeeding individuals and people with chronic conditions should consult a clinician before use.

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Bilberry Extract

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

A berry-derived supplement rich in anthocyanins, commonly used for eye health, antioxidant support, and circulatory benefits.

Eye Health Anti-inflammatory Cardiovascular Support Antioxidant Glucose Metabolism

dose range

160–480 mg

Divided into 2–3 doses daily

Consumption

Take with meals for better absorption.

Not fat-soluble.

Best time

Usually taken at breakfast and lunch or with main meals; splitting the dose may improve absorption and minimize digestive upset.

Description

Bilberry extract comes from Vaccinium myrtillus, a close relative of the blueberry, and is standardized for anthocyanin content. Traditionally used in Europe for eye and vascular health, research supports its antioxidant and possible glycemic benefits.

benefits

Main effects with level of evidence

Moderate

Note on evidence

There is moderate-quality clinical evidence for its effects on antioxidant status, with smaller controlled trials for eye and blood glucose benefits; larger and longer-term studies are needed.

Supports Eye Health

Moderate

May improve night vision, reduce symptoms of retinal disorders, and support overall visual function, especially in people with glaucoma or diabetes.

Particularly relevant for: adults · older adults · people with diabetes · people with eye health concerns

S1 · PubMed (Anthocyanins and vision function)S4 · NIH Office of Dietary Supplements: Bilberry S5 · Examine.com: Bilberry

Antioxidant and Anti-inflammatory Effects

Strong

Provides substantial antioxidant activity that helps combat oxidative stress and may reduce inflammation in the body.

Particularly relevant for: adults · older adults

S2 · PubMed (Antioxidant effects of bilberry)S5 · Examine.com: Bilberry S7 · National Center for Complementary and Integrative Health: Bilberry

May Aid Blood Glucose Regulation

Limited

Supplementation may help lower fasting blood sugar and improve insulin sensitivity in people with type 2 diabetes, though evidence is variable and it's not a substitute for medication.

Particularly relevant for: adults with type 2 diabetes

S3 · PubMed (Bilberry and glycemic control)S5 · Examine.com: Bilberry S4 · NIH Office of Dietary Supplements: Bilberry

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally well tolerated, but caution is warranted for some populations and drug interactions.

warning notices

Mild digestive discomfort is possible, especially at higher doses.
Insufficient safety data for use in pregnancy or breastfeeding; avoid use.
Monitor for hypoglycemia if diabetic and using alongside medication.
Potential increased bleeding risk when combined with anticoagulants.
Avoid use if pregnant or breastfeeding.
Monitor blood glucose closely if taking diabetes medications or insulin when using bilberry extract.
Avoid use or consult a physician before use if taking anticoagulant or antiplatelet drugs due to potential increased bleeding risk.

Known interactions with medications

anticoagulants
antiplatelet drugs
antidiabetic medications

Contraindications / special precautions

pregnancy
breastfeeding
active bleeding or bleeding disorders

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Bilberry extract may enhance the effect of blood-thinning medications and potentiate glucose-lowering drugs.

Potential interaction with anticoagulants may increase bleeding risk.

drug · Anticoagulants and antiplatelet drugs

CautionModerate

Why

Anthocyanins can affect platelet aggregation and blood clotting pathways.

recommendation

Consult a healthcare provider before combining with blood thinners; monitor for signs of bleeding.

S4 · NIH Office of Dietary Supplements: Bilberry S5 · Examine.com: Bilberry

May enhance effects of antidiabetic drugs, increasing risk of hypoglycemia.

drug · Antidiabetic medications and insulin

MonitorLimited

Why

Bilberry may lower blood sugar and thus potentiates glucose-lowering medications.

recommendation

Monitor blood sugar more closely and adjust dose as advised by a healthcare provider.

S3 · PubMed (Bilberry and glycemic control)S4 · NIH Office of Dietary Supplements: Bilberry

mechanisms of action

Brief explanations of how it works

Anthocyanin-Rich Antioxidant Activity

Bilberry extract provides anthocyanins, which neutralize free radicals and reduce oxidative stress in cells, potentially protecting against chronic disease development.

S2 · PubMed (Antioxidant effects of bilberry)S5 · Examine.com: Bilberry S7 · National Center for Complementary and Integrative Health: Bilberry