N Acetyl Cysteine (NAC) is a powerful antioxidant that supports the body's natural detoxification and anti inflammatory pathways. It works primarily by increasing glutathione, one of the body's most important protective molecules against oxidative N ACETYLCYSTEINE (NAC) Effects of N acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study. 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