HCA, Hydroxycitric Acid is identified as the principle acid found in the fruit and rind of Garcinia Cambogia. HCA appears to block the conversion of sugars and starches into fats, that this, HCA is believed to help inhibit fat production. Additionally, hydroxycitric acid is believed to suppress food intake via an anorectic effect, which also supports the belief that HCA may assist in weight loss. HCA may suppress appetite by raising levels of certain brain chemicals such as serotonin, a key stimulator of appetite.