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The FDA label includes a boxed warning regarding thyroid C-cell tumors observed in rodent studies, contraindicating use in patients with personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2

Serious reactions to vitamin B12 are very rare, and most people will never experience them

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Adults should also talk with a healthcare professional about which pain-relieving over-the-counter medications to take for symptoms following the vaccine

If youve made it here then it should be obvious that using B12 in any low thyroid state is probably a great idea