Glutathione Vs NAC: Which is Best for Skin? NAC has direct antioxidant properties on oxidant species (e.g. OH ) Download Scientific Diagram Supports Your Organs and Tissues*: NAC is the precursor to glutathione, a powerful antioxidant that helps protect cells against oxidative stress. NAC helps maintain normal cellular health by supporting the body's natural NAC vs Glutathione: Comparing Antioxidant Powerhouses for Your Health IVDrips