Garcinia cambogia is a popular weight loss supplement. It is extracted from a tropical fruit of the same name, also known as the Malabar tamarind. The fruit was traditionally used to add a sour flavor to meals, but has now become popular for its effects on weight loss. In the skin of the fruit is a large amount of a natural, biologically active substance called Hydroxycitric Acid (HCA). This is the active ingredient in garcinia cambogia, and has been shown to cause weight loss in several studies . Garcinia cambogia extract is currently the world’s most popular weight loss supplement.