Calcium citrate is insoluble in water (0.1g/100mL, 25°C). It is slightly hygroscopic. Gradually lose crystallization water when heated to l00°C. ADI value is not specified (FAO/WHO, 1994). Calcium citrate is better absorbed than inorganic calcium as a food calcium fortifier. Chinese regulations can be used in cereals and their products, the use of 8 to 16g/kg in milk drinks and beverages for 1.8 to 3.6g/kg. citric acid is a food flavor acid complexing agent, can be reacted with calcium oxalate of gallbladder, kidney, bladder and ureteral stones to generate soluble calcium citrate to make the stones smaller and disappear, can promote fat decomposition, to maintain the body's acid-base balance.