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 NutrinLife NAC L Glutathione Complex Vegecapsule 2x30's [Improved Form AA Pharmacy Glutathione Getting the k'NAC'k of Parkinson's disease The Science of Parkinson's Glutathione vs. NAC: Why You Should Take NAC for Better Absorption The Super Antioxidants: Glutathione And NAC OC Integrative Medicine