Glutathione Precursor Complex, Swanson, 60 Capsules SWU542 Glycine and N acetylcysteine (NAC) are amino acidbased nutrients that serve as precursors for glutathione, one of the body's most important intracellular antioxidants. Glutathione plays a central role in reducing oxidative stress, supporting Immunocal Glutathione Precursor Whey Protein Isolate, Immune Support Sante Medi Figure 1 from Thimerosal neurotoxicity is associated with glutathione depletion: protection with glutathione precursors. Semantic Scholar