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

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

Vaccines are one of the greatest public health successes of modern medicine. From smallpox to polio to measles, vaccines have saved millions of lives, protected entire generations from disability and death, and fortified our communities against the spread of infectious disease. But this foundation of disease prevention is now under attack.

A nonprofit anti-vaccine group founded by Robert F. Kennedy Jr. is suing him, in his capacity as secretary of the US Department of Health and Human Services, for failing to establish a task force to promote the development of safer childhood vaccines.

During a House Energy and Commerce Health Subcommittee hearing, Health Secretary Robert F. Kennedy Jr. said he’d like all Americans to use wearable health products, such as Fitbits, Apple Watches, Oura Rings, WHOOP and glucose monitors, to “control” their health and “take responsibility” for it.

Federal guidelines no longer recommend flu vaccines containing a preservative, used in a small percentage of vaccines, that has been falsely linked to autism.

The health secretary has made many inaccurate statements about vaccines. But the science is clear that vaccines have dramatically reduced childhood illness, disability and death.