ANSWER

Hydroxycitric acid (HCA), the main compound of Garcinia extract possess the potential inhibition of fatty acid biosynthesis. This derivative of citric acid is usually marketed as a weight loss supplement.

Hydroxycitric acid (HCA) helps in weight management by:-
a. Reducing appetite
b. Inhibiting fat synthesis
c. Decreasing body weight without stimulating the central nervous system

Clinical studies pertaining to Garcinia extract in weight management:-

Chuah, L., Ho, W., Beh, B., & Yeap, S. (2013). Updates on Antiobesity Effect of Garcinia Origin (−)-HCA. Evidence-Based Complementary And Alternative Medicine, 2013, 1-17. https://doi.org/10.1155/2013/751658

Roongpisuthipong, C., Kantawan, R., & Roongpisuthipong, W. (2007). Reduction of adipose tissue and body weight: effect of water soluble calcium hydroxycitrate in Garcinia atroviridis on the short term treatment of obese women in ThailandAsia Pacific Journal of Clinical Nutrition, 16(1), 25-29.

Onakpoya, I., Hung, S., Perry, R., Wider, B., & Ernst, E. (2011). 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, 2011, 1-9. https://doi.org/10.1155/2011/509038

Westerterp-Plantenga, M. S. & Kovacs, E. M. R. (2002). The effect of (-)-hydroxycitrate on energy intake and satiety in overweight humans. International Journal of Obesity, 26(6), 870.