The efficacy of N acetylcysteine in improving liver function: A systematic review and meta analysis of controlled clinical trials ScienceDirect 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 NAC Antioxidant & Detox Support Allergy Research Group Melissa Afflerbach Let's talk about NAC (aka the underrated glow from within supplement) If you've never heard of NAC (N acetyl cysteine), it's one of those Instagram