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According to a fact sheet on the FDA's website for the Pfizer-BioNTech COVID-19 vaccine, the vaccine contains only mRNA, lipids, potassium chloride, monobasic potassium phosphate, sodium chloride, dibasic sodium phosphate dihydrate and sucrose — none of which are ferromagnetic.

The vaccine also contains four salts: potassium chloride, monobasic potassium phosphate, basic sodium phosphate dihydrate and sodium chloride.