U.S. President Donald Trump recently claimed that using the common painkiller acetaminophen (also known as paracetamol and by the brand name Tylenol in the US) during pregnancy is fuelling the rise in autism diagnoses. Experts the world over immediately began debunking the claims — with many citing the findings of a landmark 2024 paper from researchers at Karolinska Institutet. One of the authors, Renee Gardner, explains exactly why their study has been so integral in discrediting Trump’s claims