A method for making the potassium, sodium and other hygroscopic salts of (-)-hydroxycitric acid and mixtures thereof workable by initial treatment with a desiccating agent, such as fumed silicon dioxide. These may be further rendered non-hygroscopic and non-reactive in acidic media via subsequent encasement in hydrophobic and acidophobic polymers. The calcium and magnesium salts of (-)-hydroxycitric acid likewise can be rendered nonreactive in acidic media. The resulting products are suitable for tableting, encapsulation and use in other dry media for weight loss, appetite suppression, improvements in fat metabolism and postprandial lipemia and other pharmaceutical purposes. Further, the products of this invention can be made nonreactive as components of acidic liquid drink mixes and snack bars and can be used in the production of controlled release administration formats.