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Green Coffee Bean Extract (Chlorogenic Acid)
Unroasted coffee extract (chlorogenic acid) marketed for weight loss. Meta-analysis shows only a small body-weight effect from a tiny evidence base — and its most famous trial was RETRACTED for data problems. Modest blood-pressure benefit is the cleaner signal.
What the evidence says
Most Green Coffee Bean studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality meta-analyses and randomised trials published 2017–2024 with a typical study size of 71 participants.
Based on 4 studies · 2 meta-analyses · 1 RCT · 71 total participants
Confidence
HighBy outcome
Green Coffee Bean has an evidence score of 3.2/10 — emerging evidence based on 4 indexed studies, including 2 meta-analyses. Unroasted coffee extract (chlorogenic acid) marketed for weight loss. Meta-analysis shows only a small body-weight effect from a tiny evidence base — and its most famous trial was RETRACTED for data problems. Modest blood-pressure benefit is the cleaner signal. Representative study: PMID 37710316.
The commonly studied dose of Green Coffee Bean is Green coffee extract providing ~400-500mg chlorogenic acid daily. 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.
Green coffee bean extract is made from unroasted coffee beans, rich in chlorogenic acid (largely destroyed by roasting). It's marketed heavily for weight loss. The honest picture: a meta-analysis of just 3 small RCTs (103 people total) found only a small body-weight reduction at ~500mg chlorogenic acid/day, and — notably — the famous 2012 trial that launched the weight-loss craze was later RETRACTED over data integrity problems (and led to an FTC settlement). The more defensible signal is a modest blood-pressure reduction. It contains some caffeine. Treat weight-loss claims skeptically.
May slow glucose absorption and influence fat metabolism; degraded by roasting.
Polyphenol antioxidant activity.
How Green Coffee Bean 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.
Green coffee extract providing ~400-500mg chlorogenic acid daily
Take with food
| Form | Type |
|---|---|
| 💊Chlorogenic-acid-standardized extract | Recommended |
| 💊Svetol | Alternative |
Weight-loss claims are weak; flagship trial retracted.
Minimum: 8 weeks
Optimal: 12 weeks
Cycling: Not required
Note: With meals; caffeine — not late in day.
Dose-response data unavailable. The current published research for Green Coffee Bean 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.
A small, low-confidence body-weight reduction.
Modestly lowers blood pressure.
Note the caffeine content.
Avoid — caffeine + limited data.
Chlorogenic acid may modestly affect glucose — monitor.
Additive caffeine effects.
Tip: Avoid late-day dosing
Tip: Take with food
Both are polyphenol/caffeine-containing extracts with modest metabolic effects.
Layered (modest) metabolic support.
Both are popular weight-loss supplements with weak underlying evidence.
(Both modestly/poorly evidenced for weight.)
Both are popular but weakly/unproven weight-loss supplements.
(Both poorly evidenced for weight.)
The best time to take Green Coffee Bean is with meals. Take it with food. Taken before/with meals; contains some caffeine, so avoid late in the day.
Green Coffee Bean is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are caffeine effects (jitteriness, insomnia), GI upset. Use caution if any of these apply to you: Caffeine sensitivity; Anxiety disorders; Pregnancy/breastfeeding (caffeine + limited data).
Concentrated catechins from green tea that support metabolism, fat oxidation, brain health, and antioxidant defense.
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