HomeHealth NewsVaccine additive thimerosal deemed unsafe by the CDC: 3 things to know

Vaccine additive thimerosal deemed unsafe by the CDC: 3 things to know

July 9, 2025

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An expert outlines three things to know about thimerosal safety and why this vaccine ingredient is controversial. Image credit: Luis Velasco/Stocksy.

The United States federal government may soon ban vaccines that use an ingredient called thimerosal.
Thimerosal is a preservative that — due to questions about its safety throughout the decades — has mostly been avoided by vaccine producers.
However, it still features in some flu shots, which has prompted questions about how a potentially…

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