Glutathione vs NAC for Liver Repair: What Clinical Research Really Sho NAC Made Simple: A Guide to Glutathione, Detox, and Rejuvenation Kindle edition by Green, Neil C. Health, Fitness & Dieting Kindle eBooks @ Amazon.com. Glutathione and NAC Reduce the Severity of COVID 19 Glutathione vs. NAC: Why You Should Take NAC for Better Absorption 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