Function and sources
Hydroxycitrate is a derivative of citric acid, which is an important metabolic intermediate. Citric acid is found naturally in many plant and animal tissues. Commercially it is either extracted from citrus fruits (lemon juice contains 5-8 percent citric acid), or via the fermentation of sugar by the mold Aspergillus niger, and used as flavoring or acidifying agent (E-330), while its salts (the citrates) are employed as acidity regulators (E-331 to E-333).
Hydrocitric acid by contrast is found in only a few plants, and primarily in the tamarind fruit of Southeast Asia.
Uses
Hydroxycitrate can suppress the appetite and therefore it can induce weight loss. It appears to do that by interfering in the conversion of sugars into fat, but without irritation of the central nervous system. It also helps to reduce cholesterol and triglycerides.
Caution
Hydroxycitrate should not be taken by persons allergic to citrus fruits, with a history of migraines headaches, and those who suffer from diseases of the gallbladder.