The real danger of Tylenol isn't autism it's liver failure. Acetaminophen, the active ingredient in Tylenol and many cold and flu medications, is one of the leading causes of liver failure 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: Your livers unsung hero: Glutathione , Lets talk about what really happens when you take Tylenol (acetaminophen)., Your liver breaks down acetaminophen through several pathways. One pathway creates Tylenol's Impact on Glutathione and Liver Damage Tylenol lowers glutathione, which is why it can cause liver failure. Low glutathione can cause many serious health problems that can vary from person to person. Finding out if you have genes that can Researchers are studying a possible link between acetaminophen (Tylenol) use during pregnancy and higher autism or ADHD risk. It may lower glutathione, an important antioxidant for brain development.