3 Glutathione Rescue Normally, glutathione binds NAPQI and converts it into non toxic byproducts (cysteine + mercapturic acid) that are excreted. Example: Glutathione is your liver's safety net against toxins. Full article: The acetaminophen metabolite N acetyl p benzoquinone imine ( NAPQI) inhibits glutathione synthetase in vitro; a clue to the mechanism of 5 oxoprolinuric acidosis? Napqi hi res stock photography and images Alamy What does NAPQI stand for? Did you know that high doses of paracetamol can be toxic to your liver? Paracetamol, also known as acetaminophen, is a commonly used painkiller that can have harmful effects on the body