What Is Glutathione? A Summary of Glutathione Lifespan Research Institute NAC N Acetyl Cysteine + Glutathione 120 Capsules 2028mg Antioxidant Supplement 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 N acetylcysteine reduces the hepatic complications of social isolation stress through modulation of interleukin 1 and 6 gene expression and liver enzymes in mice Scientific Reports