The researches found out that amongst the fruit's ingredient is Hydroxycitric Acid (HCA) which has.

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Moreover, an increase in the levels of serotonin in the body as a result of taking Garcinia Cambogia promotes weight loss and prevents obesity. This happens because Garcinia Cambogia extract contains high levels of hydroxycitric acid or HCA, which triggers the brain to release serotonin. However, because of the increase of serotonin levels in the body as a result of taking Garcinia Cambogia, a person does need to eat foods rich in sugar and carbohydrates to fulfill his or her body's need for an energy boost.

A 2011 British review of nine studies concluded that supplementation with Garcinia cambogia extract (GCE) may lead to short-term weight-loss, but a more recent human trial from Korea that compared the effects of GCE and another supplement, EGML, an extract of the leaves of Glycine max (soybean), found that neither led to weight loss natural loss. Biologically active substance HCA (hydroxycitric acid) 95% works synergistically with the body's own mechanisms to effectively burn existing fat, targeting specifically belly fat, and help eliminate it, for good. Igho Onakpoya et al The Use of Garcinia Extract (Hydroxycitric Acid) as a Weight loss Supplement: A Systematic Review and Meta-Analysis of Randomised Clinical Trials," Journal of Obesity, doi: 10.