Green coffee extract is an extract of unroasted, green coffee beans. It is used in the Swiss Water Process for decaffeinating coffee. It has as well as been used as a weight-loss adjunct and as an ingredient in new weight-loss products but its efficacy and mechanism of affect 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 In 2014, one of the primary trials showing gain was retracted and the company that sponsored the study, Applied Food Sciences, was fined by the Federal Trade Commission for making baseless weight-loss claims using the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 afterward be prepared as an infusion from green coffee beans.
A 2011 evaluation found tentative evidence that green coffee extract promotes weight loss; however, the mood of the evidence was poor. This evaluation looked at three published randomized controlled trials of green coffee extract, totaling 142 participants, and found a small effect. The review stated that more rigorous trials taking into account 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 mass their exercise in adjunct to taking the supplement. One of the trials was retracted in 2014 because the truthfulness of the data was unclear.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 psychoanalysis version dropped out due to adverse endeavors including aching and urinary tract infection.
A larger 2017 evaluation 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 enlarged glucose and lipid metabolism, as well as anti-oxidant and anti-inflammatory activity. The evaluation noted that potential adverse effects of both immediate and long-term consumption had not still been investigated thoroughly, and that the number of studies performed on humans has correspondingly far and wide been limited.
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