Tylenol (acetaminophen) does not cause autism. The FDA, in its statement that there may be an association, confirmed that "a causal relationship has not been established, and studies of millions of children Acetaminophen Toxicity: How Genetic Susceptibility Combines with Environmental Factors Pediatric doctor discusses 20 year awareness of Tylenol's role in autism risk factors Mercury induced excitotoxicity in autism spectrum disorder: disruption of glutamatergic homeostasis and the therapeutic role of the selenium glutathione axis BioMetals Springer Nature Link