Kennedy’s unorthodox ideas about a wide range of health subjects may appear disparate to those who haven’t trawled through his more than a dozen books.

Some experts say the move undermines science, disrupts a trusted regulatory process and could sow public distrust in vaccinations and federal health agencies.

The Department of Health and Human Services sent Congress a document to support Secretary Robert F. Kennedy Jr.’s decision to change federal vaccine recommendations that cited unpublished or disputed studies and misrepresented other findings,