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 in substance use disorder: a lesson from preclinical and clinical research Pharmacological Reports Springer Nature Link Proposed molecular mechanism by which N acetyl cysteine (NAC) Download Scientific Diagram Long term N acetylcysteine administration rescues liver steatosis via endoplasmic reticulum stress with unfolded protein response in mice Lipids in Health and Disease Springer Nature Link