Glutathione The Master Antioxidant With Enormous Benefits Wellness By Rosh Integrative Wellness NAC [N AcetylCysteine] is a precursor of Glutathione. PICTURE: Glutathione is made from three amino acids and cysteine is one of them N Acetyl Cysteine BioAge Nutritionals As I mention in my book, N acetyl cysteine (NAC) is not found in food sources, but in the body, it converts into cysteine. NAC acts as a precursor to glutathione, a powerful Meno Clinic NAC (N Acetyl L Cysteine): Building Blocks for Glutathione Meno Clinic