Cysteine is one of the few amino acids that contains sulfur .This allows cysteine to bond in aspecial way and maintain the structure of proteins in the body. Cysteine is a component of the antioxidant glutathione . The body also usescysteine to producetaurine , another amino acid.
L-Cysteine is also used as a processing aid for baking. In the field of personal care, cysteine is used for permanent-wave applications, predominantly in Asia.