What is thimerosal, does it have side effects and why is RFK Jr. removing the controversial preservative from the flu shot?

The mercury-based ingredient has prompted concerns from some organizations, although the CDC has said there is no evidence it ...

The CDC says there is no evidence of harm from mercury-based thimerosal.

Although it has been largely phased out of U.S. vaccines, thimerosal has long been targeted by anti-vaccine advocates.

The federal government is recommending flu vaccines remove the preservative thimerosal after Health and Human Services ...

Following a recommendation from a panel of CDC advisors, HHS Secretary Robert F. Kennedy Jr. on Wednesday ordered that the ...

Health and Human Services Secretary Robert F. Kennedy Jr. has signed off on a recommendation to remove thimerosal from all ...

The move targets thimerosal, a preservative that anti-vaccine activists blame for neurodevelopmental disorders, despite ...

RFK Jr. approves a nationwide shift to mercury-free flu vaccines, ending decades of thimerosal use amid rising safety and ...

While few shots still contain thimerosal, the move eliminates a vaccine option for Americans and is a win for the ...

Decades of research show the mercury-containing preservative thimerosal is safe in vaccines, but CDC's new advisory panel is raising concerns about its safety.