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 Napqi hi res stock photography and images Alamy Too Much of a Good Thing: Inadvertent Acetaminophen Overdose in a Low Weight, Elderly Patient Reasons to Get a Glutathione Injection Century Medical & Dental Center