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Last September, President Donald Trump, Robert F. Kennedy Jr, and other health officials declared they had uncovered a new treatment for autism spectrum disorder (ASD): leucovorin. A new study shows that plenty of families believed them, despite the lack of data supporting the drug’s effectiveness.

Last September, President Donald Trump, Robert F. Kennedy Jr, and other health officials declared they had uncovered a new treatment for autism spectrum disorder (ASD): leucovorin. A new study shows that plenty of families believed them, despite the lack of data supporting the drug’s effectiveness.