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He and his father, Mark, collaborated for years on articles claiming a connection between vaccines containing a compound called thimerosal as a preservative and a rise in autism diagnoses.

The ban applies to Red No. 3, Red No. 40, Yellow No. 5, Yellow No. 6, Blue No. 1, Blue No. 2 and Green No. 3 along with the preservatives butylated hydroxyanisole and propylparaben.

Take, for example, how European processed foods use fewer artificial preservatives, or how some nations have stricter regulations on food production — something else Büchel mentioned in her presentation.

While it is still used in some flu vaccines, parents can request a formulation without the preservative for their children.

He questioned the safety of thimerosal, a common vaccine preservative, advancing the debunked claim it could lead to autism.