A tree native to Southeast Asia. The fruit is used in traditional medicine as well as a food. The rind is rich in hydroxycitric acid (HCA), which can inhibit ATP citrate lyase, a key enzyme in the synthesis of fatty acids. Garcinia cambogia extracts are often added to fat loss supplements for this reason, as well as its reputed ability to suppress appetite. Its effects on fat loss are debatable, however…a large scale study on 135 subjects showed no significant effects.
See Paul’s review: “Citrimax / Hydroxycitric Acid (HCA): Does Citrimax Block Carbs?” for more information.