As a precursor to make glutathione, NAC has been used for decades both as an acute medication and as an over the counter supplement. Recently, the line between medication and supplement has been NAC N Acetyl L Cysteine Allergy Research Group Acetylcysteine, N acetylcysteine, NAC Drug Molecule. it is an Antioxidant and Glutathione Inducer. Skeletal Chemical Formula Stock Vector Illustration of hydrogen, formula: 309612521 N AcetylL Cysteine 600 mg Capsules (NAC) Natural Factors USA Glutathione Vs NAC: Which is Best for Skin?