Garcinia cambogia, also known as Malabar tamarind, is a small, sweet tropical fruit that resembles a pumpkin. hydroxycitric acid fat loss(It is the source of the spice tamarind, found in many curries.) In the late 1960s, scientists discovered an acid in the fruit similar to the citric acid in oranges and lemons. This acid, called hydroxycitric acid, abbreviated as HCA, is an especially good weight-loss aid,hydroxycitric acid fat loss.