evidence: Vaccines do not cause mercury toxicity or autism, contrary to claim in London Real video Vaccines do not cause autism or mercury toxicity. The amount of mercury that infants receive through their diet is more than twice the amount ever contained in vaccines. Scientific evidence shows that autism spectrum disorder (ASD) arises through a combination of genetics and environment. Twin studies demonstrate a strong heritable component to ASD, with heritability estimates ranging from about 30 to 90%. Many genes involved in ASD risk are associated with brain and neuronal development. [...] Buttar claims that vaccines labeled thimerosal-free still contain thimerosal but provides no evidence to support his statement. He also makes several claims about the toxicity of other vaccine ingredients, namely formaldehyde, nickel, aluminum, and "DNA adducts", again without any scientific evidence. It is true that formaldehyde can be toxic and that it is used in vaccine production. However, the amount of formaldehyde present in vaccines is too low to cause toxicity. The Vaccine Education Center at the Children’s Hospital of Philadelphia states: