NAC vs Glutathione: Which Antioxidant Is Right for You? Momentous Effects of N acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study. ScienceDirect As I mention in my book, N acetyl cysteine (NAC) is not found in food sources, but in the body, it converts into cysteine. NAC acts as a precursor to glutathione, a powerful The Yack on NAC (N Acetyl Cysteine) and Parkinson's Journey with Parkinson's NAC is one of those supplements that I always have on hand. It's impressive how broadly supportive NAC is. One time I was taking NAC 500 mg every day for about two Amazon.com: Advanced Complex NAC Supplement (N Acetyl L Cysteine) 600mg with L Glutathione 500mg and Milk Thistle Extract Potent Antioxidant Immune Function Support Respiratory Health Promotes Liver Kidney Detox : Health & Household