US President Donald Trump linked autism to childhood vaccine use and the taking of popular pain medication Tylenol by women when pregnant, elevating claims not backed by scientific evidence to the forefront of US health policy, earlier this week.

In an extraordinary news conference at the White House, the Republican president delivered medical advice to pregnant women and parents of young children, repeatedly telling them not to use or administer the painkiller and suggesting that common vaccines not be taken together or so early in a child’s life.

The advice from Trump, who acknowledged he is not a doctor, goes against that of medical societies, which cite data from numerous studies showing that acetaminophen, the active ingredient in Tylenol, plays a safe role in the well-being of pregnant women.

“I want to say it like it is, don’t take Tylenol. Don’t take it,” Trump said.

“Other things that we recommend, or certainly I do anyway, is … don’t let them pump your baby up with the largest pile of stuff you’ve ever seen in your life,” he said, referring to vaccines.

The widely used over-the-counter pain relief medication is also known generically as paracetamol elsewhere.

TRUMP ADMINISTRATION BACKS LEUCOVORIN AS TREATMENT

Trump’s team suggested leucovorin, a form of folinic acid, opens new tab, as a treatment for autism symptoms.

Dozens of medical, research, and autism advocacy groups, including the American Academy of Pediatrics and the American College of Obstetricians and Gynecologists, decried the president’s announcement.

“The data cited do not support the claim that Tylenol causes autism and leucovorin is a cure, and only stoke fear and falsely suggest hope when there is no simple answer,” the Coalition of Autism Scientists said in a statement.

Standing with Health Secretary Robert F. Kennedy Jr., a vaccine critic who has argued that no vaccine is safe, Trump called for a reexamination of a link between vaccines and autism, a theory that has been repeatedly debunked.

“We believe independent, sound science clearly shows that taking acetaminophen does not cause autism. We strongly disagree with any suggestion otherwise and are deeply concerned with the health risk this poses for expecting mothers and parents,” Kenvue, the maker of Tylenol, said in a statement.