Garcinia cambogia extract comes from the fruit of the Garcinia cambogia tree that grows across Southeast Asia. Other common names for the tree include Brindall berry, Malabar tamarind, Uppagi, and Gamboge. The fruit contains hydroxycitric acid (HCA), which makes up the bulk of the extract. Garcinia Cambogia extract: Hydroxycitric acid (HCA), is the active ingredient extracted from the rind of a little pumpkin-like fruit, Garcinia cambogia, from India and Southeast Asia. Dietary supplements and a wide variety of weight loss formulas, contain Garcinia extract to inhibit fat production and suppress appetite.