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NAC: The Remarkable Supplement I Underestimated for Years I have a confession to make. For many years, I underestimated the value of N-acetylcysteine, better known as NAC. It wasn't that I thought NAC was unimportant. I simply thought I understood its primary purpose: to serve as a precursor to glutathione, one of the body's most important antioxidants. And since I had long been using S-acetyl glutathione, a form designed to deliver glutathione directly and effectively, I saw little reason to su …