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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 Meta-analysis shows only a small body-weight effect from a tiny evidence base — and its most famous trial was RETRACTED for data problems.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 high-quality meta-analyses and randomised trials published 2005–2026 with a typical study size of 49 participants.
Based on 38 studies · 10 meta-analyses · 20 RCTs · 266 total participants
Confidence
High confidenceBy outcome
A meta-analysis of just 3 small RCTs found only a small weight effect, the flagship trial was retracted, and the cleaner blood-pressure signal is modest, so confidence stays low.
32 rigorous studies
22 randomized trials · 7 meta-analyses · 3 systematic reviews
Our evidence rating for Green Coffee Bean is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
2 trials ongoing or recruiting · 11 completed on ClinicalTrials.gov
Registered trials show research momentum for Green Coffee Bean, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Green Coffee Bean meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
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.
Note the caffeine content.
Avoid — caffeine + limited data.
Chlorogenic acid may modestly affect glucose — monitor.
May add modestly to blood-pressure lowering — monitor.
Additive caffeine effects.
Tip: Avoid late-day dosing
Tip: Take with food
Green Coffee Bean has an evidence score of 3.2/10 — emerging evidence based on 31 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.
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. Reported side effects are uncommon and include caffeine effects (jitteriness, insomnia), GI upset. Use caution if any of these apply to you: Caffeine sensitivity; Anxiety disorders; Pregnancy/breastfeeding (caffeine + limited data).
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 38 studies · how we score · editorial policy
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.
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