Acetaminophen Toxicity: How Genetic Susceptibility Combines with Environmental Factors Vaccines do not cause autism. Neither does acetaminophen (Tylenol) use in pregnancy. Decades of rigorous research and systematic reviews have shown no credible link. Continuing to promote these myths is not only Tylenol can lower the body's key antioxidant, glutathione, though this isn't seen on routine labs. But mechanistic data clinical proof, so we still need good trials. The Tylenolautism link isn't clear. What the research says about autism and acetaminophen use during pregnancy Yale School of Public Health Pediatric doctor discusses 20 year awareness of Tylenol's role in autism risk factors