The mechanism of action of N acetylcysteine (NAC): The emerging role of H2S and sulfane sulfur species ScienceDirect N acetyl L Cysteine 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: Master Antioxidant, Reducing Oxidative Stress, and Detoxification The acute effect of different NAD+ precursors included in the combined metabolic activators ScienceDirect All About NAC (N acetylcysteine): What it is and what benefits it has Zenement