The aim of this systematic review is to examine the efficacy of Garcinia It is concluded that the RCTs suggest that Garcinia extracts/HCA can cause short-. With a thin skin and deep vertical lobes, the fruit of Garcinia Cambogia "HCA is primarily found in the rind of Garcinia Cambogia, where 10% to (rarely) 30% of. Abstract. Garcinia cambogia extract (GCE) comes from a tropical fruit grown in India and Southeast Asia. The active ingredient has been.