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 Amino Acids: Why Supplements May Not Work 6 health benefits of glutathione The Transulphuration Pathway Lifecode Gx Support Glutathione IV Therapy Benefits, Uses, and What to Expect Tu Clnica Hispana Familiar Frontiers The versatile utility of cysteine as a target for cancer treatment