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 The Yack on NAC (N Acetyl Cysteine) and Parkinson's Journey with Parkinson's Interaction with Ethanol Alcohol Metabolism Glutathione Getting the k'NAC'k of Parkinson's disease The Science of Parkinson's NAC and Glutathione: The Amino Acid the Supplement Industry Is Not Telling You About