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 Glutathione vs. NAC: Which Antioxidant Is Best for Your Liver? Life Extension The Combined Antioxidant Effects of N Acetylcysteine, Vitamin D3, and Glutathione from the IntestinalNeuronal In Vitro Model N acetylcysteine (NAC) solution alters cysteine and glutathione based Download Scientific Diagram