(R)-2-Amino-4-mercaptobutanoic acid is a cysteine derivative. In Vitro Amino acids and amino acid derivatives have been commercially used as ergogenic supplements. They influence the secretion of anabolic hormones, supply of fuel during exercise, mental performance during stress related tasks and prevent exercise induced muscle damage. They are recognized to be beneficial as ergogenic dietary substances. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid