Green coffee extract is an extract of unroasted, green coffee beans. It is used in the Swiss Water Process for decaffeinating coffee. It has plus been used as a weight-loss accessory and as an ingredient in new weight-loss products but its efficacy and mechanism of accomplishment have been controversial.
There is tentative evidence of weight-loss benefit; however, the quality of the evidence is poor. In 2014, one of the primary trials showing improvement was retracted and the company that sponsored the study, Applied Food Sciences, was fined by the Federal Trade Commission for making baseless weight-loss claims using the flawed study.
Green coffee extract is sold below various proprietary brand names including Svetol, and is included in weight-loss products such as CoffeeSlender. It can furthermore be prepared as an infusion from green coffee beans.
A 2011 evaluation found tentative evidence that green coffee extract promotes weight loss; however, the environment of the evidence was poor. This review looked at three published randomized controlled trials of green coffee extract, adding together 142 participants, and found a small effect. The review stated that more rigorous trials later longer duration were needed to assess the efficacy and safety of green coffee as a weight loss supplement. Participants in the studies were instructed to restrict their diet and bump their exercise in adjunct to taking the supplement. One of the trials was retracted in 2014 because the precision of the data was unclear. The three clinical trials reported no adverse effects; however, the review noted that two participants in an unrelated non-trial investigation report dropped out due to adverse comings and goings including cause discomfort and urinary tract infection.
A larger 2017 review assessed the effects of chlorogenic acids, the main phenolic compounds in green coffee extract. It included studies of chlorogenic acids both as a constituent of coffee and directly as a purified extract, and suggested several beneficial effects, in particular improved glucose and lipid metabolism, as well as anti-oxidant and anti-inflammatory activity. The evaluation noted that potential adverse effects of both gruff and long-term consumption had not yet been investigated thoroughly, and that the number of studies performed upon humans has hence far-off been limited.
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