Glutathione Vs NAC: Which is Best for Skin? Wait until you see what N acetyl cysteine (NAC) can do! Free radical protection* Maintains cellular health* A sulfur containing amino acid* Promotes production of glutathione* *These statements have not N acetylcysteine (NAC) is an antioxidant and anti inflammatory compound that helps the body reduce oxidative stress by boosting levels of glutathione, one of the body's main natural defenses against inflammation. In a study Glutathione vs. NAC: Which Antioxidant Is Best for Your Liver? Life Extension Which is better for detoxification, NAC or glutathione? Glutathione vs. NAC: Which Antioxidant Is Best for Your Liver? Life Extension