Calcium sulfate is an inorganic compound with the formula CaSO4. It occurs naturally as the mineral gypsum and is used in various applications including as a desiccant, in plaster, and as a food additive (E516). In food, it serves as a firming agent and is recognized for its ability to improve texture. It is also used in the production of tofu and as a coagulant in various food processes. Calcium sulfate is non-toxic and generally recognized as safe (GRAS) when used in food applications. Its low solubility in water makes it suitable for applications where a slow release of calcium ions is desired.