NAC Antioxidant & Detox Support Allergy Research Group N acetylcysteine (NAC): Health Benefits, Side Effects, Dosage, and More N Acetyl Cysteine (NAC) for Detox Supplements 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 N Acetyl Cysteine (NAC) for Detox Supplements N Acetyl Cysteine PatchMD Vitamin Patches and Supplements