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ingestible · for weight management

Green Coffee Bean Extract

Reviewed by the Nimbera editorial team · Last updated May 2026

Meta-analysis of 3 RCTs (Systematic Reviews 2023, PMID 37710316) found green coffee bean extract with 500 mg/day chlorogenic acid reduced body weight by -1.30 kg (95% CI: -2.07 to -0.52) vs. placebo. Evidence base is small (103 participants total) and study durations were short. Treat as preliminary.$15-$30 per month.

How to use

Take 400-800 mg of standardized green coffee bean extract (standardized to at least 45-50% chlorogenic acid) daily in divided doses before meals. Do not exceed 800 mg per day.

How it works

Chlorogenic acids in unroasted green coffee beans may slow glucose absorption in the gut, reduce hepatic glucose production, and modestly increase fat metabolism. Roasting destroys most chlorogenic acid content, which is why green (unroasted) beans are used.

Where to buy

Health food stores and online retailers. Look for products standardized to at least 45% chlorogenic acid content. Third-party testing (NSF, Informed Sport) is recommended.

Typical cost: $15-$30 per month.

Safety notes

Green coffee bean extract contains caffeine - expect roughly 20-50 mg per serving depending on the product. Avoid if sensitive to caffeine or if taking stimulant medications. May raise blood pressure. Not suitable during pregnancy or breastfeeding. The overall evidence base is very small and more trials are needed before this can be recommended with confidence.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Lessa et al. Systematic Reviews 2023 - PMID 37710316

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.