The present invention relates to soluble dimeric double metal salt compositions of (−)-hydroxycitric acid (“HCA”), as well as methods for making and using the same. The invention provides dimeric double metal salts of group IA and IIA of HCA (hereinafter, “DDM-HCAs”). The present invention provides methods to make DDM-HCAs of the invention which can be employed to alter the polar/ionic qualities of HCA salts and derivatives to improve solubility of HCA compositions. DDM-HCAs of the invention are soluble HCA-containing compositions useful as dietary supplements and suitable for manipulations under those conditions necessary for tabletting, encapsulation, and the production of dry powders, particularly for use as a beverage premix. Methods of use of the composition include treatment for suppression of appetite, for weight loss, for an increase in the rate of fat metabolism, for reduction in blood lipids and postprandial lipemia, and to increase the plasma level of (−)-hydroxycitric acid.