Evidence-based·Last reviewed May 31, 2026·How we grade evidence

Anthocyanins

Q: 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.

Q: 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.

Q: 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.

Q: 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.

Q: 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.

PhytochemicalAnthocyaninBest with a meal

Flavonoid pigments that give berries, cherries, red cabbage, and purple corn their colour. Strongest evidence is observational — higher dietary anthocyanin intake links to lower heart-disease and type-2-diabetes risk. Supplements give cleaner doses but show smaller effects than the original berry foods.

Quick decision guide

May help most

Anyone looking for a food-first cardiometabolic strategy — eat berries 3+ times a week.

Common dosing range

100-300 mg/day from supplement extracts; ½ cup of blueberries or blackberries provides 100-200 mg.

When to expect effects

4-12 weeks for blood-pressure and LDL changes; long-term dietary pattern for cohort-level benefits.

Watch out for

Supplements vary in anthocyanin content and stability — pigments degrade with heat and time. Food is more reliable than capsules.

Evidence snapshot

Cardiovascular risk reduction (dietary)Moderate

Blood pressure & LDL (supplement RCTs)Moderate

Type 2 diabetes risk (dietary cohorts)Moderate

Cognitive function in older adultsEmerging

Exercise recovery / sleep (tart cherry)Emerging

Vision / bilberry traditional useLow

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).

Is it worth it for you?

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

Worth considering if…

You already enjoy berries — 3+ servings a week aligns with the strongest cardiometabolic evidence

You want a food-based strategy to nudge LDL and blood pressure down modestly (eat the berries, don't just take a capsule)

You're an athlete using tart-cherry juice for delayed-onset muscle soreness — small but consistent signal

You're an older adult who finds blueberries easy to add — modest cognitive-perfusion signal in small RCTs

Probably skip if…

You're hoping a supplement capsule will replace eating actual berries — bioavailability and matrix effects favour food

You're using bilberry for night vision or 'eye health' — traditional claim, evidence is weak in modern RCTs

You're taking it to prevent or treat cancer — only mechanistic / lab evidence, no human RCTs

You take warfarin or other anticoagulants in high doses — theoretical bleeding-risk additivity (talk to your prescriber first)

Evidence at a glance

Goal	Effect	Best fit	Time
Cardiovascular disease risk reduction Good Evidence	Cohorts: ~30% lower MI risk with 3+ berry servings/week. RCTs: ~0.2 mmol/L LDL reduction, ~2 mmHg systolic BP reduction.	Adults with elevated cardiometabolic risk who can sustain 3+ berry servings per week; people willing to swap a daily snack for berries	4-12 weeks for blood-pressure/LDL; years of dietary pattern for hard-endpoint cohorts
Type 2 diabetes risk reduction (dietary) Good Evidence	~9-12% lower incident T2D in highest vs lowest dietary intake quintile; HbA1c reductions in RCTs are small and inconsistent	Adults with metabolic syndrome or T2D risk factors who can add berries to their regular diet	Long-term dietary pattern (years of cohort data)
Cognitive function (older adults) Limited Evidence	Small improvement in cognitive task performance and brain perfusion in 12-week RCTs in older adults	Cognitively healthy older adults adding berry concentrate as part of dietary pattern	12 weeks in trials
Exercise recovery (tart cherry, blackcurrant) Limited Evidence	Modest reduction in post-exercise muscle damage markers; smaller, inconsistent effect on subjective recovery	Endurance athletes or strength trainees with heavy training blocks who can dose 4-7 days around the event	Acute (within 24-72 hours of dosing around an event)
Eye health (bilberry traditional use) Mixed Evidence	No clinically meaningful improvement in modern RCTs for vision endpoints	Nobody specifically — eat berries as part of a healthy diet for whole-body benefit	Not established for vision outcomes

Cardiovascular disease risk reduction

Good Evidence

Effect: Cohorts: ~30% lower MI risk with 3+ berry servings/week. RCTs: ~0.2 mmol/L LDL reduction, ~2 mmHg systolic BP reduction.
Best fit: Adults with elevated cardiometabolic risk who can sustain 3+ berry servings per week; people willing to swap a daily snack for berries
Time: 4-12 weeks for blood-pressure/LDL; years of dietary pattern for hard-endpoint cohorts

Type 2 diabetes risk reduction (dietary)

Good Evidence

Effect: ~9-12% lower incident T2D in highest vs lowest dietary intake quintile; HbA1c reductions in RCTs are small and inconsistent
Best fit: Adults with metabolic syndrome or T2D risk factors who can add berries to their regular diet
Time: Long-term dietary pattern (years of cohort data)

Cognitive function (older adults)

Limited Evidence

Effect: Small improvement in cognitive task performance and brain perfusion in 12-week RCTs in older adults
Best fit: Cognitively healthy older adults adding berry concentrate as part of dietary pattern
Time: 12 weeks in trials

Exercise recovery (tart cherry, blackcurrant)

Limited Evidence

Effect: Modest reduction in post-exercise muscle damage markers; smaller, inconsistent effect on subjective recovery
Best fit: Endurance athletes or strength trainees with heavy training blocks who can dose 4-7 days around the event
Time: Acute (within 24-72 hours of dosing around an event)

Eye health (bilberry traditional use)

Mixed Evidence

Effect: No clinically meaningful improvement in modern RCTs for vision endpoints
Best fit: Nobody specifically — eat berries as part of a healthy diet for whole-body benefit
Time: Not established for vision outcomes

Evidence for 5 uses

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

Cardiovascular disease risk reduction

Supplement benefit

Good Evidence

The Nurses' Health Study II (Cassidy 2013) tracked 93,600 women for 18 years and found that 3+ servings/week of anthocyanin-rich berries (strawberries + blueberries) associated with 32% lower MI risk. The Kimble 2019 systematic review of 19 RCTs found modest reductions in LDL (~0.2 mmol/L), systolic BP (~2 mmHg), and improved flow-mediated dilation with anthocyanin supplementation (median 320 mg/day for 4-12 weeks). Cohort signal is stronger than RCT signal — typical for food-based interventions.

Effect size

Cohorts: ~30% lower MI risk with 3+ berry servings/week. RCTs: ~0.2 mmol/L LDL reduction, ~2 mmHg systolic BP reduction.

Time to effect

4-12 weeks for blood-pressure/LDL; years of dietary pattern for hard-endpoint cohorts

Best fit

Adults with elevated cardiometabolic risk who can sustain 3+ berry servings per week; people willing to swap a daily snack for berries

Less likely

Adults expecting a supplement capsule to match the cohort-level effects of dietary berries

Bottom line: Real but modest. Eat berries; don't expect a capsule to deliver the same effect.

SourceCassidy et al., 2013 — Circulation Kimble et al., 2019 — Critical Reviews in Food Science and Nutrition

Type 2 diabetes risk reduction (dietary)

Supplement benefit

Good Evidence

Guo 2016's meta-analysis of prospective cohorts (~200,000 people combined) found 9-12% lower T2D incidence in the highest anthocyanin-intake quintile vs the lowest. Effect strongest for berry intake; weaker for total flavonoid intake without specific berry contribution. RCT evidence on glycemic markers (HbA1c, fasting glucose) with anthocyanin extracts is mixed and modest.

Effect size

~9-12% lower incident T2D in highest vs lowest dietary intake quintile; HbA1c reductions in RCTs are small and inconsistent

Time to effect

Long-term dietary pattern (years of cohort data)

Best fit

Adults with metabolic syndrome or T2D risk factors who can add berries to their regular diet

Less likely

People with established T2D expecting anthocyanin extracts to replace metformin or lifestyle change

Bottom line: Adding berries to a healthy diet aligns with the protective signal. Don't rely on supplement capsules for T2D prevention.

SourceGuo et al., 2016 (meta-analysis) — Scientific Reports

Cognitive function (older adults)

Supplement benefit

Limited Evidence

Small RCTs in older adults have shown modest cognitive and brain-perfusion improvements with 12 weeks of blueberry concentrate (~387 mg anthocyanins/day). The Bowtell 2017 trial (n=26) saw improved working memory and increased brain perfusion on MRI. The InCHIANTI cohort linked higher anthocyanin intake to slower physical-function decline. Total trial population to date is small; effect sizes are modest; replication is needed.

Effect size

Small improvement in cognitive task performance and brain perfusion in 12-week RCTs in older adults

Time to effect

12 weeks in trials

Best fit

Cognitively healthy older adults adding berry concentrate as part of dietary pattern

Less likely

Adults with established mild cognitive impairment or dementia

Bottom line: Promising but small trials. Reasonable add-on if you already enjoy berries; don't bank on it.

SourceBowtell et al., 2017 — Applied Physiology, Nutrition, and Metabolism Jennings et al., 2017 — American Journal of Clinical Nutrition

Exercise recovery (tart cherry, blackcurrant)

Supplement benefit

Limited Evidence

Tart cherry juice and New Zealand blackcurrant extracts are the most-studied anthocyanin-rich athletic supplements. Reviews show modest attenuation of muscle-damage markers (creatine kinase) and inflammation after strenuous exercise. Functional recovery (strength, soreness ratings) improves in some trials but not others. Sleep-quality improvement with tart cherry is partly attributable to its melatonin content, not anthocyanins alone.

Effect size

Modest reduction in post-exercise muscle damage markers; smaller, inconsistent effect on subjective recovery

Time to effect

Acute (within 24-72 hours of dosing around an event)

Best fit

Endurance athletes or strength trainees with heavy training blocks who can dose 4-7 days around the event

Less likely

Recreational exercisers without acute high-volume training stress

Bottom line: Worth trying around a hard race or training block; not a daily must-have.

SourceCook et al., 2017 — European Journal of Sport Science Howatson et al., 2012 — European Journal of Nutrition

Eye health (bilberry traditional use)

Mechanism only

Mixed Evidence

Bilberry extract (an anthocyanin concentrate, often standardized to 25% anthocyanosides as Mirtoselect) was reputedly used by WWII RAF pilots to improve night vision — the story is largely apocryphal. Modern RCTs of bilberry for night vision, retinopathy, and macular degeneration are small, mixed, and generally negative for clinically meaningful improvements. Memorial Sloan Kettering's About Herbs review calls the clinical evidence weak.

Effect size

No clinically meaningful improvement in modern RCTs for vision endpoints

Time to effect

Not established for vision outcomes

Best fit

Nobody specifically — eat berries as part of a healthy diet for whole-body benefit

Less likely

Anyone hoping to slow macular degeneration or improve night driving

Bottom line: The famous 'WWII pilot' story doesn't survive modern trial scrutiny. Don't buy bilberry capsules for your eyes.

SourceMemorial Sloan Kettering — Bilberry — About Herbs

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.

How to take it

1. Typical dose

• Food first: ½ cup blueberries or blackberries (~100-200 mg anthocyanins) • Supplement extract: 100-300 mg/day (read the label — total extract weight is not the same as anthocyanin content) • Bilberry standardized to 25% anthocyanosides: 80-160 mg twice daily (the historical 'eye health' dose, evidence weak) • Tart cherry juice concentrate: 30 mL twice daily around a hard training block

2. Higher studied dose

Up to 640 mg/day anthocyanins in cardiovascular RCTs. Doses above this haven't been studied for added benefit.

3. Timing

With a meal containing some fat improves absorption of the small fraction that is bioavailable. Splitting morning + evening doses may smooth out the short half-life.

4. With food

With food (fat helps absorption).

5. Split dosing

Splitting doses morning/evening is reasonable given short plasma half-lives — anthocyanins peak in plasma within 1-3 hours.

6. How long to try

Cardiovascular outcomes are about long-term dietary pattern (months to years). Trial supplement for 8-12 weeks; reassess.

What to track

Berry servings per week (food intake is more meaningful than capsule count)

Blood pressure (small reductions seen in trials)

LDL cholesterol (small reductions seen in trials)

GI tolerance — high-dose extracts can cause loose stools

Bottom line: Eat berries. If you want a capsule on top, 100-300 mg/day of an extract that labels its anthocyanin content is reasonable.

6 commercial forms

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

Whole berries (fresh or frozen)

Food-first

Blueberries, blackberries, strawberries, black currants, elderberries, chokeberries. The form with the strongest cohort-level evidence for cardiometabolic outcomes. Frozen berries retain anthocyanin content as well as fresh.

Best-evidenced form; whole-food matrix supports the protective signal.

Berry juice / concentrate

Liquid extract

Tart cherry juice concentrate, pomegranate juice, blueberry concentrate — used in many exercise-recovery and cardiometabolic RCTs. Often standardized to a per-mL anthocyanin content. Watch the sugar content of full-strength juices.

Higher per-serving anthocyanin density than whole fruit; sugar content can be significant.

Freeze-dried whole-berry powder

Concentrated food

Whole berries dehydrated and powdered, preserving the food matrix. Good convenience option; quality varies widely by brand. Look for a labeled anthocyanin content per serving.

Better than isolated extracts at preserving co-occurring nutrients.

Bilberry extract (standardized)

Traditional eye-health

Vaccinium myrtillus extract standardized to 25-36% anthocyanosides (Mirtoselect). Studied for night vision, retinopathy, venous insufficiency; modern RCT evidence is weak. Generally well tolerated.

Standardized anthocyanoside content; clinical effect is modest at best.

Elderberry (Sambucus nigra) extract

Cold / flu folk use

Folk-medicine staple for colds and flu. Small RCTs (Sambucol) suggest modest reduction in flu symptom duration, but mechanism is debated and evidence is small and industry-funded.

High anthocyanin content (~1,375 mg/100 g); evidence for respiratory illness is modest.

Isolated cyanidin-3-glucoside (purified)

Research compound

Purified single anthocyanin used in research. Not commonly sold to consumers in this form. Bioavailability of the isolated compound is poor compared with food-matrix delivery.

Mostly research use; bioavailability ~<1%.

Safety

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

Common side effects

mild GI upset (loose stools at high doses)harmless temporary stool darkening from anthocyanin pigment

Serious risks

Theoretical bleeding-risk additivity with warfarin, aspirin, or other antiplatelets at high doses — flavonoids inhibit platelet aggregation in vitro, but clinical bleeding events are rare.
SourceMemorial Sloan Kettering — Bilberry — About Herbs

Who should avoid it

People on warfarin or other anticoagulants — discuss with the prescriber before taking high-dose extracts.
SourceMemorial Sloan Kettering — Bilberry — About Herbs
People scheduled for surgery in the next 2 weeks — stop concentrated extracts (food-level intake is fine).
SourceMemorial Sloan Kettering — Bilberry — About Herbs

Pregnancy & breastfeeding

Anthocyanins from food (berries, fruits, vegetables) are safe and beneficial in pregnancy. Concentrated supplement extracts haven't been specifically tested in pregnancy and are not recommended.

SourceLinus Pauling Institute Micronutrient Information Center — LPI — Flavonoids

Bottom line: Very safe from food. Capsule extracts are well tolerated but theoretical interactions with anticoagulants exist.

Interactions

warfarin and other anticoagulantsModerate

Theoretical additive bleeding risk via in vitro platelet inhibition. Clinical events are rare but discuss with the prescriber before starting concentrated extracts.

SourceMemorial Sloan Kettering — Bilberry — About Herbs

antiplatelet agents (aspirin, clopidogrel)Minor

Theoretical additive antiplatelet effect; food-level berry intake has not been linked to clinical bleeding.

SourceMemorial Sloan Kettering — Bilberry — About Herbs

Food sources

Food	Amount	%DV
Chokeberry (aronia), raw	100 g (~1,480 mg)	—
Elderberry, raw	100 g (~1,375 mg)	—
Black currant, raw	100 g (~533 mg)	—
Blueberry, raw	1 cup (~165 mg)	—
Blackberry, raw	1 cup (~210 mg)	—
Cherry, sweet, raw	1 cup (~140 mg)	—
Red cabbage, shredded raw	1 cup (~92 mg)	—
Concord / black grape, raw	1 cup (~120 mg)	—
Strawberry, sliced	1 cup (~35 mg)	—
Plum, fresh	1 medium (~25 mg)	—
Eggplant skin, raw	1 cup (~14 mg)	—
Red onion, raw	½ cup (~25 mg)	—

Chokeberry (aronia), raw

Amount: 100 g (~1,480 mg)
%DV: —

Elderberry, raw

Amount: 100 g (~1,375 mg)
%DV: —

Black currant, raw

Amount: 100 g (~533 mg)
%DV: —

Blueberry, raw

Amount: 1 cup (~165 mg)
%DV: —

Blackberry, raw

Amount: 1 cup (~210 mg)
%DV: —

Cherry, sweet, raw

Amount: 1 cup (~140 mg)
%DV: —

Red cabbage, shredded raw

Amount: 1 cup (~92 mg)
%DV: —

Concord / black grape, raw

Amount: 1 cup (~120 mg)
%DV: —

Strawberry, sliced

Amount: 1 cup (~35 mg)
%DV: —

Plum, fresh

Amount: 1 medium (~25 mg)
%DV: —

Eggplant skin, raw

Amount: 1 cup (~14 mg)
%DV: —

Red onion, raw

Amount: ½ cup (~25 mg)
%DV: —

Choosing a product

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

Look for…

Total anthocyanin content per serving stated in mg — not just total 'fruit extract' weight

Standardized extracts (e.g. Mirtoselect bilberry standardized to 36% anthocyanosides)

Third-party tested (USP, NSF, ConsumerLab)

Dark amber or opaque bottle — anthocyanins degrade with light and heat

Freeze-dried whole-berry powders are a reasonable middle ground between food and isolated extracts

Be skeptical of…

'Eye health' or 'night vision' bilberry marketing — the WWII pilot story doesn't survive modern RCTs

'Anti-aging' or 'longevity' anthocyanin claims — no human trial supports these specific endpoints

Mega-doses (1+ gram) marketed for cancer prevention — only mechanistic / lab evidence

Combination 'antioxidant blends' that don't quantify individual anthocyanin content

Products that promise to replace eating actual berries — bioavailability and the whole-food matrix matter

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 by claim

Safety

Linus Pauling Institute Micronutrient Information Center — LPI — Flavonoids (2016) link

Cardiovascular disease risk reduction

Cassidy et al., 2013 — Circulation (2013) link

Kimble et al., 2019 — Critical Reviews in Food Science and Nutrition (2019) link

Cognitive function (older adults)

Jennings et al., 2017 — American Journal of Clinical Nutrition (2017) link

Bowtell et al., 2017 — Applied Physiology, Nutrition, and Metabolism (2017) link

Type 2 diabetes risk reduction (dietary)

Guo et al., 2016 (meta-analysis) — Scientific Reports (2016) link

Exercise recovery (tart cherry, blackcurrant)

Howatson et al., 2012 — European Journal of Nutrition (2012) link

Cook et al., 2017 — European Journal of Sport Science (2017) link

Eye health (bilberry traditional use)

Memorial Sloan Kettering — Bilberry — About Herbs (2024) link

Other references

USDA Database for the Flavonoid Content of Selected Foods — USDA Agricultural Research Service (2014) link

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Evidence-based·Last reviewed May 31, 2026·Evidence current as of May 31, 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.