Glutathione (GSH) is named Reduced glutathione or L-GlutathioneReduced ,an important antioxidant in plants, animals, fungi, and some bacteria and archaea,a white crystalline powder. It is atripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side chain and the amine group of cysteine, and the carboxyl group of cysteine is attached by normal peptide linkage to a glycine.Thiol groups are reducing agents, existing at a concentration around 5 mM in animal cells. Glutathione reducesdisulfide bonds formed within cytoplasmicproteins to cysteines by serving as an electron donor. In the process, glutathione is converted to its oxidized form, glutathione disulfide (GSSG), also called L-glutathione. Glutathione (GSH) is named Reduced glutathione or L-GlutathioneReduced,a white crystalline powder. It is atripeptide with a gamma peptide linkage between the carboxyl group of the glutamate side chain and the amine group of cysteine, and the carboxyl group of cysteine is attached by normal peptide linkage to a glycine. Glutathione reduces disulfide bonds formed within cytoplasmicproteins to cysteines by serving as an electron donor. In the process, glutathione is converted to its oxidized form, glutathione disulfide (GSSG), also called L-glutathione.