Let's talk Tylenol Paracetamol (acetaminophen) There are many side effects that most people don't realize. OTC does not mean it is side effect free, especially with chronic use. Even just 4 days of 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. Acetaminophen Overdose Reveals PAR4 as a Low Expressing but Potent Receptor on the Hepatic Endothelium in Mice Arteriosclerosis, Thrombosis, and Vascular Biology 5 Oxoprolinuria as a Cause for Metabolic Acidosis Renal Fellow Network Myth busting, Acetaminophen version. "Avoid Acetaminophen (Tylenol) because it causes glutathione depletion". Truth?? As a pediatrician and ER doctor and as moms we're often asked about this. And we understand why: