Medical groups, foreign health organizations , and some lawmakers threw a conniption this week after President Donald Trump and Health and Human Services Secretary Robert F. Kennedy Jr. dared to take action over the apparent association between autism and prenatal exposure to acetaminophen, the active ingredient in Tylenol.

A popular tactic taken by critics was to refute a claim the Trump administration wasn't making, namely that acetaminophen was causally linked to autism.

The American College of Obstetricians and Gynecologists, for example, stated , "In more than two decades of research on the use of acetaminophen in pregnancy, not a single reputable study has successfully concluded that the use of acetaminophen in any trimester of pregnancy causes neurodevelopmental disorder

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