Green coffee bean extract is made from unroasted coffee beans, which contain more chlorogenic acid than roasted beans, and is sold for weight loss. NIH says only a few trials have tested it in people, all of poor quality.
Also known as: green coffee extract, chlorogenic acid, GCA.
The 3 trials in the meta-analysis used 180 or 200 mg a day for 4 to 12 weeks (ODS, Onakpoya 2011). These are study protocols, not a recommendation.
It is sold in the US as a dietary supplement. Under the 1994 dietary supplement law (DSHEA), FDA does not approve dietary supplements before they are marketed, and the maker, not FDA, is responsible for safety and labeling. Green coffee beans contain caffeine, though decaffeinated forms exist (ODS).
What studies show: a 2011 meta-analysis of 3 trials found about 2.5 kg more weight loss than placebo, but all trials had a high risk of bias, and the authors called the methods poor (Onakpoya 2011). Another small trial that reported large weight loss was strongly criticized by the US Federal Trade Commission for critical design flaws, and two of its three authors retracted it (ODS, Vinson 2012).
Safety, per ODS: it appears well tolerated, but its safety has not been rigorously studied. Reported side effects include headaches and urinary tract infections, and its caffeine can cause stimulant side effects, more so with other stimulants.
We could not find a single published half-life or time to peak for green coffee bean extract that applies to a supplement dose, so we do not list one.
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