On September 22, the Food and Drug Administration announced it was approving a new use of a drug called leucovorin calcium tablets as a treatment for cerebral folate deficiency, which the administration also presented as a promising treatment for the symptoms of autism. In the days and hours after the announcement, tens of thousands of parents of autistic children joined a Facebook group, first set up in May, to share information about the drug.

The “Leucovorin for Autism” group was flooded with chaos, confusion, and conspiracy theories, according to a WIRED review, with parents, pediatricians, nurses, and affiliate marketers seeking to fill the void of information left by the Trump administration.

One angry parent shared an email from their health care provider refusing to prescr

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