Hydroxycitric acid (HCA), a derivative of citric acid, is found primarily in a small, sweet, purple fruit called the Malabar tamarind or, as it is most commonly called, Garcinia cambogia . Test tube and animal research suggests that HCA may be helpful in weight loss because of its effects on metabolism. However, studies in humans have found mixed results.
HCA is not an essential nutrient. The Malabar tamarind is the only practical source of this supplement.
A typical dosage of HCA is 250 to 1,000 mg 3 times daily. Supplements are available in many forms, including tablets, capsules, powders, and even snack bars. Products are often labeled Garcinia cambogia and standardized to contain a fixed percentage of HCA. Various proprietary forms of HCA are also available, often claimed by their promoters to be more effective.
It remains unclear whether HCA offers any weight-loss benefits.
In contrast, a 12-week, double-blind, placebo-controlled trial of 135 overweight individuals, who were given either placebo or 500 mg of HCA (as Garcinia cambogia extract standardized to contain 50% HCA) 3 times daily, found no effect on body weight or fat mass. 16 However, this study has been criticized for using a high-fiber diet, which is thought to impair HCA absorption. 17
A 12-week double-blind trial of 89 individuals found that HCA had no effect on appetite. 18 Another study tested HCA to see if it could cause weight loss by altering metabolism, but no effects on metabolism were found. 19
The Malabar tamarind (from which HCA is extracted) is a traditional food and flavoring in Southeast Asia. No serious side effects have been reported from animal or human studies involving either fruit extracts or the concentrated chemical. A proprietary calcium-potassium salt of HCA appears to have undergone considerable formal safety study, without evidence of toxicity appearing. 20 However, maximum safe doses have not been established, especially for pregnant or nursing women, young children, or people with severe liver or kidney disease.
12. Kriketos AD, Thompson HR, Greene H, et al. (-)-Hydroxycitric acid does not affect energy expenditure and substrate oxidation in adult males in a post-absorptive state. Int J Obes Relat Metab Disord . 1999;23:867-873.
14. Kovacs EM, Westerterp-Plantenga MS, Saris WH. The effects of 2-week ingestion of (-)-hydroxycitrate and (-)-hydroxycitrate combined with medium-chain triglycerides on satiety, fat oxidation, energy expenditure and body weight. Int J Obes Relat Metab Disord. 2001;25:1087-1094.
19. Kriketos AD, Thompson HR, Greene H, et al. (-)-Hydroxycitric acid does not affect energy expenditure and substrate oxidation in adult males in a post-absorptive state. Int J Obes Relat Metab Disord . 1999;23:867-873.
21. Vasques CA, Rossetto S, Halmenschlager G, et al. Evaluation of the pharmacotherapeutic efficacy of Garcinia cambogia plus Amorphophallus konjac for the treatment of obesity. Phytother Res. 2008;22:1135-1140.
Last reviewed August 2013 by EBSCO CAM Review Board
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