Anthocyanins

non-nutrient/non-botanicalanthocyanin cation

What is it

Anthocyanins are a class of water-soluble flavonoid pigments responsible for the red, purple, and blue colors of many fruits and vegetables, including berries, grapes, red cabbage, and dark cherries. They are consumed in food and as concentrated extracts (notably bilberry, blueberry, and elderberry).

How it works

Anthocyanins exert their effects through multiple mechanisms. As potent antioxidants, they scavenge reactive oxygen species and chelate metal ions, with some anthocyanins showing antioxidant activity exceeding that of vitamin C or vitamin E in laboratory assays. Research suggests anthocyanins improve vascular function by enhancing endothelial nitric oxide production, reducing arterial stiffness, and improving flow-mediated dilation. They also modulate inflammation through inhibition of NF-kB and reduced inflammatory cytokine production. Anthocyanins may improve insulin sensitivity and have been linked to reduced risk of type 2 diabetes in observational studies. Anthocyanin bioavailability is limited; intact anthocyanins are poorly absorbed, with much activity attributed to gut bacterial metabolites including phenolic acids that are more readily absorbed and biologically active. Peak plasma levels occur 1-3 hours after consumption and decline rapidly.

Evidence for 5 uses

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

Cardiovascular health

Grade B

Good evidence

Multiple trials show anthocyanin-rich berry consumption improves endothelial function, reduces blood pressure modestly, and improves cholesterol profiles. Observational studies link higher intake to reduced cardiovascular risk.

Type 2 diabetes risk

Grade B

Good evidence

Large observational studies link higher dietary anthocyanin intake to reduced risk of type 2 diabetes. Clinical trials suggest improvements in insulin sensitivity and glucose control.

Cognitive function

Grade C

Moderate evidence

Several trials in older adults show modest cognitive benefits with berry or anthocyanin supplementation, particularly for memory and executive function.

Exercise recovery

Grade C

Moderate evidence

Trials of tart cherry and other anthocyanin-rich foods suggest reduced muscle soreness and faster recovery from intense exercise.

Eye health (bilberry)

Grade D

Mixed evidence

Bilberry anthocyanins have been popularly used for vision, particularly night vision. Clinical evidence is limited and largely negative for night vision specifically.

5 commercial forms

Bilberry extract

Standardized to 25-36% anthocyanosides; the most-studied concentrated form.

Used for circulatory and eye support. Most clinical research uses standardized extracts.

Berry powder (freeze-dried)

Preserves the natural anthocyanin profile of the whole fruit.

Provides full-spectrum anthocyanins along with fiber and other phytochemicals.

Elderberry extract

Rich in unique anthocyanin profile; also contains other immune-supporting compounds.

Popular for cold and flu support with some clinical evidence for reducing symptom duration.

Black currant extract

High anthocyanin and vitamin C content.

Used for eye health and immune support.

Tart cherry concentrate

Concentrated source of anthocyanins for exercise recovery.

Trials support modest benefits for muscle soreness and recovery.

Dosage

There is no established RDA. Typical dietary intakes range from 10-200 mg per day depending on berry consumption. Supplement doses of standardized anthocyanin extracts range from 80-500 mg per day. Clinical trials use widely varying amounts.

When and how to take it

Anthocyanin-rich foods and supplements can be consumed at any time. Plasma levels peak 1-3 hours after consumption and decline rapidly, so split dosing (morning and evening, or with each meal) may produce more sustained exposure. Take with food to support absorption.

Food sources

Food	Amount	%DV
Blueberries (1 cup)	approx 150-200 mg anthocyanins	—
Blackberries (1 cup)	approx 100-150 mg anthocyanins	—
Black raspberries (1 cup)	approx 600-800 mg anthocyanins (highest among berries)	—
Tart cherries (1 cup)	approx 100 mg anthocyanins	—
Red cabbage (1 cup raw)	approx 50-100 mg anthocyanins	—
Pomegranate (1 medium)	approx 50-100 mg anthocyanins	—
Black beans (1/2 cup cooked)	approx 10-15 mg anthocyanins	—

Safety

Anthocyanins are very safe in dietary amounts and well tolerated as concentrated supplements. Side effects are uncommon and include mild gastrointestinal upset. Berries and berry extracts are sometimes used during pregnancy without apparent issues, though concentrated extracts lack specific safety data in pregnancy.

Who should be cautious

People taking anticoagulants or scheduled for surgery should consult a clinician at high supplemental doses. People with diabetes who take medication should monitor blood glucose when adding concentrated anthocyanin supplements. Otherwise, anthocyanin-rich foods are widely recommended.

Interactions

Anthocyanins may have mild antiplatelet effects and could theoretically increase bleeding risk with anticoagulants or antiplatelet drugs. They may modestly affect blood glucose, with potential to enhance the effects of diabetes medications. No major drug interactions have been well documented at typical dietary or supplemental doses.

Frequently asked questions

What gives berries their dark color?⌄

Anthocyanins are responsible for the red, purple, and blue pigments in berries, grapes, and other foods. The depth of color is a rough indicator of anthocyanin content.

How much should I aim for daily?⌄

Most dietary guidelines suggest aiming for several servings of berries or other anthocyanin-rich foods weekly. Studies showing cardiovascular benefits often used 100-200 g of berries daily.

Do supplements work as well as eating berries?⌄

Whole berries provide anthocyanins along with fiber, vitamins, and other beneficial compounds. Concentrated extracts deliver higher anthocyanin doses but lack the food matrix benefits.

Can I take anthocyanins with my blood pressure medication?⌄

Anthocyanins may modestly lower blood pressure. Combining with antihypertensive medication is generally not problematic but warrants monitoring.

Do anthocyanins really help with night vision?⌄

The famous WWII-era story about bilberry and night vision lacks rigorous support. Modern clinical trials have generally not shown improvements in night vision from bilberry anthocyanins.

References

Wikidata: Anthocyanin — Wikidata link

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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.