NAC The New Addiction Emed 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 Acetyl Cysteine (Glutathione Precursor) The mechanism of action of N acetylcysteine (NAC): The emerging role of H2S and sulfane sulfur species ScienceDirect Glutathione Getting the k'NAC'k of Parkinson's disease The Science of Parkinson's Acetaminophen Pathway (toxic doses), Pharmacokinetics