Green coffee extract is an extract of unroasted, green coffee beans. It is used in the Swiss Water Process for decaffeinating coffee. It has then been used as a weight-loss accessory and as an ingredient in other weight-loss products but its efficacy and mechanism of feign have been controversial.
There is tentative evidence of weight-loss benefit; however, the feel of the evidence is poor. In 2014, one of the primary trials showing benefit was retracted and the company that sponsored the study, Applied Food Sciences, was fined by the Federal Trade Commission for making baseless weight-loss claims using the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 under various proprietary brand names including Svetol, and is included in weight-loss products such as CoffeeSlender. It can with be prepared as an infusion from green coffee beans.
A 2011 review found tentative evidence that green coffee extract promotes weight loss; however, the air of the evidence was poor. This evaluation looked at three published randomized controlled trials of green coffee extract, adding up 142 participants, and found a little effect. The review acknowledged that more rigorous trials later than 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 growth their exercise in adjunct to taking the supplement. One of the trials was retracted in 2014 because the accuracy of the data was unclear. The three clinical trials reported no adverse effects; however, the evaluation noted that two participants in an unrelated non-trial psychotherapy description dropped out due to adverse events including dull pain 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 with ease as anti-oxidant and anti-inflammatory activity. The review noted that potential adverse effects of both immediate and long-term consumption had not nevertheless been investigated thoroughly, and that the number of studies performed on humans has suitably far-off been limited.
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