Taurine, also known as β-aminoethanesulfonic acid, was first isolated from bezoar, hence the name. Appearance is colorless or white oblique crystals, odorless, chemically stable, soluble in organic solvents such as ether, is a sulfur-containing non-protein amino acid, exists in a free state in the body, and does not participate in the biosynthesis of protein in the body. Although taurine is not involved in protein synthesis, it is closely related to the metabolism of cystine and cysteine.