Amino Acid Derivatives biochemistry Acetaminophen: Is Too Much of a Good Thing Too Much? Compendium of Continuing Education in Dentistry Poisoning in Pregnancy Obgyn Key We know that *glutathione* is what detoxifies NAPQI. So, why must we give its precursor, N acetylcysteine (NAC), instead of just giving glutathione directly? A. Glutathione has poor bioavailability and cannot enter the Glutathione for the skin Paula's Choice