Allergy Research Group NAC N Acetyl L Cysteine NAC Sustain 60 tablets N acetyl cysteine, antioxidant and glutathione precursor to support liver function 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 The mechanism of action of N acetylcysteine (NAC): The emerging role of H2S and sulfane sulfur species ScienceDirect