The Combined Antioxidant Effects of N Acetylcysteine, Vitamin D3, and Glutathione from the IntestinalNeuronal In Vitro Model Glutathione, NAC & Vitamin C 30 Veg caps Glutathione, NAC & Vitamin C L Glutathione VS NAC: Differences, Similarities, and Uses NAC is a great supplement. It's awesome stuff to support healthy lungs. NAC is a known mucolytic. That is a fancy term meaning breaking up mucus. Now, research does show that NAC Effects of N acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study. ScienceDirect