The acute effect of different NAD+ precursors included in the combined metabolic activators ScienceDirect NAC vs Glutathione: Comparing Antioxidant Powerhouses for Your Health IVDrips 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 and NAC Reduce the Severity of COVID 19 L Glutathione VS NAC: Differences, Similarities, and Uses