Jim Carrey

Carrey believes that MMR vaccine causes autism, which is contrary to scientific consensus. In 2009, he wrote an article questioning the merits of vaccination and vaccine research for The Huffington Post. With former partner Jenny McCarthy, Carrey led a “Green Our Vaccines” march in Washington, D.C., to advocate for the removal of toxic substances from children's vaccines, out of a belief that children had received "too many vaccines, too soon, many of which are toxic".