The agency confirmed it is working on a report, but declined to comment on its conclusions. “Until we release the final report, any claims about its contents are nothing more than speculation,” a spokesperson for HHS emailed in a statement. There is no credible scientific evidence that acetaminophen causes autism or that leucovorin (a derivative of folic acid) can prevent the disorder, as the HHS report purportedly will suggest, according to reporting by the Wall Street Journal. “It is disingenuous and misleading to boil autism’s causes down to one simple thing,” said Dr. Alycia Halladay, chief science officer at the Autism Science Foundation, in a statement. Folate deficiency in a mother increases the risk of neural tube defects including spina bifida, but the link to autism is unclear.