Nature's fusionsneuro-nac™ 800/375mg extra - 60 capsules (20 servings) why neuro-nac? nac ethyl ester with glycine is 20x more bioavailable than nac and crosses the blood brain barrier. It increases glutathione, the mother of all antioxidants, which promotes eye health, brain health, cellular health, detoxification and proper immune function. Why nutri? at nutri we believe in making the highest quality and most effective products on the market, so that you can be confident that you're getting the best of the best. . Nature's fusions neuro-nac 800/375mg extra - 60 capsules (20 servings)