Multiscale modelling approach combining a kinetic model of glutathione metabolism with PBPK models of paracetamol and the potential glutathione depletion biomarkers ophthalmic acid and 5 oxoproline in humans and rats Integrative Biology (RSC Too much paracetamol = dangerous because of how your liver processes it. *Normal dose:* About 90 95% gets broken down safely by glucuronidation + sulfation non toxic stuff you pee out. *The problem Yes there is good evidence that acetaminophen (the active ingredient in Tylenol) can deplete glutathione under certain conditions. But whether that matters depends on dose, duration, and individual factors. Combination of Paracetamol and the Glutathione Depleting Agent Buthionine Sulfoximine Show Differential Effect on Liver Cancer Cells and Normal Hepatocytes