NAC Skin Care Benefits of NAC 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 Acetylcysteine, N acetylcysteine, NAC drug molecule. It is an antioxidant and glutathione inducer. Skeletal chemical formula. Vector illustration Stock Vector Image & Art Alamy N ACETYLCYSTEINE (NAC) Healthy Origins NAC (N Acetyl Cysteine) Healthy Origins