We use essential cookies (authentication, your saved goals/stack) by default. With your permission we'll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Acai Berry (Euterpe oleracea)
A dark-purple Amazonian palm berry rich in anthocyanins and marketed heavily as an antioxidant 'superfruit'. The honest reality: human evidence is limited to a handful of small, mostly short-term trials — antioxidant capacity and a couple of biomarker shifts, with no demonstrated effect on hard health outcomes.
What the evidence says
Most Acai studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 2008–2020 with a typical study size of 30 participants.
Based on 4 studies · 3 RCTs · 100 total participants
Confidence
ModerateBy outcome
Acai has an evidence score of 2.5/10 — emerging evidence based on 4 indexed studies. A dark-purple Amazonian palm berry rich in anthocyanins and marketed heavily as an antioxidant 'superfruit'. The honest reality: human evidence is limited to a handful of small, mostly short-term trials — antioxidant capacity and a couple of biomarker shifts, with no demonstrated effect on hard health outcomes. Representative study: PMID 29850709.
The commonly studied dose of Acai is No established efficacy dose; trials used 200 mL/day juice or ~325 mL twice daily of polyphenol beverage. Capsule/powder products commonly provide 500-1000mg dried extract.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Explore: Best supplements for Vitality & Longevity
Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Acai (Euterpe oleracea) is the fruit of an Amazonian palm, prized for its very high anthocyanin (polyphenol) content, which gives it strong antioxidant capacity in laboratory assays. That test-tube antioxidant story is what drives its 'superfruit' marketing — but high ORAC values do not automatically translate to clinical benefit. The actual human data is thin: a small acute crossover trial confirmed anthocyanins are absorbed and transiently raise plasma antioxidant capacity; a 4-week crossover found modest HDL-cholesterol and antioxidant-enzyme improvements in healthy adults; and a 12-week pilot in metabolic-syndrome patients moved only two of many inflammation/oxidative-stress biomarkers, with no change in glucose or lipid metabolism. A small phase II prostate-cancer trial did not meet its endpoint. No trial has shown effects on disease outcomes, weight, or longevity. Acai is a perfectly reasonable food, but as a supplement the evidence is emerging at best.
Acai anthocyanins are absorbed and transiently raise plasma antioxidant capacity, scavenging reactive oxygen species in laboratory and acute human assays.
Short-term intake has been associated with increased activity of endogenous antioxidant enzymes (catalase, glutathione peroxidase) in a small crossover study.
How Acai works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Tap node to isolate • Pinch to zoom • Tap edge for research
No established efficacy dose; trials used 200 mL/day juice or ~325 mL twice daily of polyphenol beverage. Capsule/powder products commonly provide 500-1000mg dried extract.
Take with food
| Form | Type |
|---|---|
| 🧪Freeze-dried powder or pulp | Recommended |
| 💊Standardized extract capsule | Alternative |
| 💊Juice blend | Alternative |
Whole-fruit forms are closest to those studied; avoid sugary juice blends marketed as health drinks.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Consumed as a food; no specific timing benefit established.
Dose-response data unavailable. The current published research for Acai does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Acute intake raises plasma antioxidant capacity for a few hours; clinical relevance unclear.
A 4-week study in healthy adults found a small (~8%) HDL-cholesterol increase; not replicated in larger trials. (within-group change only; the trial found no significant difference vs placebo)
No trial has shown effects on disease outcomes, weight, glucose metabolism, or longevity.
Safe as a food; concentrated supplement extracts are not specifically studied — favor whole-fruit amounts.
Some unprocessed acai berries have been used as oral contrast in research; not relevant to typical supplement use.
No clinically significant drug interactions are well-documented; as a polyphenol-rich food, theoretical interactions are minimal at dietary doses.
Tip: Take with food; reduce dose
Both are antioxidants; commonly combined in 'superfruit' formulations, though no trial tests the combination.
Layered dietary antioxidant intake (theoretical only).
Both are polyphenols marketed for antioxidant/longevity support, with similarly thin human-outcome data.
Broader polyphenol exposure; no proven additive benefit.
The best time to take Acai is with meals. Take it with food. Taken with meals as a food/polyphenol source; no trial-validated supplement dose exists.
Acai is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are mild GI upset. Use caution if any of these apply to you: Known allergy to acai or related palm fruits.
Gel-forming soluble fiber that lowers LDL cholesterol, regulates blood sugar, and promotes digestive regularity.