The present invention relates to a cocrystal of beta-sitosterol or a pharmaceutically acceptable ester thereof or an edible acceptable ester thereof and an organic carboxylic acid coformer, an hydrate crystal form of beta-sitosterol having 1.25 molecules of water per molecule of beta-sitosterol and a combination that comprises a cocrystal of beta-sitosterol and an organic carboxylic acid； and the hydrate crystal form of beta-sitosterol having 1.25 molecules of water per molecule of beta-sitosterol. It also relates to processes for their preparation, and compositions containing them, as well as their use as a medicament or dietary supplement or functional food, and in particular in the prophylaxis and/or treatment of a disease or conditions that involves an alteration of lipid metabolism, circulating levels of lipids in the blood and/or lipid composition in tissues and organs.
