What Is Thimerosal? Why Most Vaccines Don’t Contain Mercury Anymore

Thimerosal, which contains an organic compound of mercury, has mostly been phased out as a preservative for vaccines. Here’s how we know it is safe and why we still use it in some vaccines given to adults

SINSIN
Jun 27, 2025 - 03:00
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What Is Thimerosal? Why Most Vaccines Don’t Contain Mercury Anymore

Thimerosal, which contains an organic compound of mercury, has mostly been phased out as a preservative for vaccines. Here’s how we know it is safe and why we still use it in some vaccines given to adults

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