NAC vs Glutathione: Differences, Similarities And Health Benefits N Acetylcysteine amide 38520 57 9 NBA52057 Biosynth Glutathione vs. NAC: Which Antioxidant Is Best for Your Liver? Life Extension Why NAC (N Acetylcysteine) in an IV? Reduces oxidative stress NAC helps replenish glutathione, one of your body's most powerful antioxidants. Supports detoxification Assists in clearing toxins NAC [N AcetylCysteine] is a precursor of Glutathione. PICTURE: Glutathione is made from three amino acids and cysteine is one of them