HHS Secretary Robert F. Kennedy Jr. is requiring all new vaccines to undergo placebo testing in a new policy change meant to promote greater transparency.

The potential change outlined in a statement would require all new vaccines to undergo placebo testing, sparking concerns among medical experts.

Per the Post, which first reported the story, “‘All new vaccines will undergo safety testing in placebo-controlled trials prior to licensure — a radical departure from past practices,’ an HHS spokesperson told The Washington Post in response to questions about Kennedy’s comments on the measles vaccines and general vaccine policy."