What ingredient, if added to vaccines, could scientifically cause autism?

There is no scientific evidence to support the idea that any ingredient added to vaccines causes autism. Here are some key points from the research:

MMR Vaccine and Autism

Extensive studies have shown that the MMR vaccine does not cause autism. Multiple large-scale studies in various countries have found no link between the MMR vaccine and the development of autism134.

Thimerosal

Thimerosal, a mercury-containing preservative, was once used in some vaccines. However, numerous studies have found no link between thimerosal and autism. Thimerosal was largely removed from childhood vaccines by 2001, yet autism diagnoses continued to rise34.

Aluminium Adjuvants

There is no substantial scientific evidence that aluminium adjuvants, used in some vaccines to enhance the immune response, are linked to autism. Studies and reviews by reputable health organizations have not found any credible link4.

Formaldehyde

Formaldehyde, used in some vaccine production processes, is also not linked to autism. It is naturally present in the body and environment, and the amounts used in vaccines are considered safe4.

In summary, the scientific consensus is clear: there is no ingredient in vaccines that has been proven to cause autism. The evidence from numerous studies and reviews supports the safety of vaccines in this regard123.