Posts falsely claim Pfizer added heart-stabilizing ingredient to kids’ vaccine

Several social media posts and a blog that publishes COVID-19 and vaccine misinformation have been spreading the claim that Pfizer changed its formulation for the children’s COVID-19 vaccines to include an ingredient used to stabilize heart attack patients. The ingredient in question, tromethamine, is a commonly used buffer that allows mRNA to be safely stored for longer periods. The buffer will be added as an inactive ingredient to all Pfizer vaccine formulations, not only the lower-dose vaccine for children under 12, and has nothing to do with heart issues.

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