Although it was never actually linked to any real side effects, thimerosal (mercury) was removed from almost all childhood vaccines in 1999.

Thimerosal, a preservative, only remained in flu vaccines for a few years, but thimerosal free flu vaccines have been available since 2003.

Although most anti-vaccine groups have moved on to other conspiracy theories to scare parents, some still falsley claim that vaccines continue to be made with thimerosal and that thimerosal is dangerous.

Get more information about thimerosal and vaccines: