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Thimerosal, or sodium ethylmercurithiosalicylate, is a preservative used in low concentrations mainly in vaccines, cosmetics, ophthalmic and otolaryngolic medications, antitoxins, topical and ...

Mercury is a known neurotoxin, so even without believing that it causes autism, one might argue for removing thimerosal entirely from vaccines. However, this option is not risk-free.

He wanted to reassure parents who were worried about the effects of a mercury-based preservative called thimerosal, found in some vaccines. Prof Offit confesses he was excited to be able to talk a ...