Supports Antioxidant and Detoxification Activity* N-Acetyl-Cysteine (NAC) is a source of the conditionally essential amino acid L-cysteine and a precursor to the tripeptide glutathione. NAC and glutathione support antioxidant and detoxification activity in the body.* For more information go to this link or https://www.xymogen.com/formulas/products/129