Taurine is a sulfur-containing amino acid with simple structure in animals. Its chemical name is 2- aminoethanesulfonic acid, and its molecular formula is C2H7NO3S, and its molecular weight is 125.15. Taurine is odorless and slightly sour. Its dilute solution is neutral and stable to heat. It is combined with cholic acid in human and animal bile and exists in a combined form. However, in brain, ovary, heart, liver, milk, pineal gland, pituitary gland, retina, adrenal gland and other tissues, it exists in free form, with a total amount of 12-18g, but does not participate in the synthesis of protein.