can b12 injections be harmful Feeling worse after Injection: Answering concerns Do B12 Shots Expire or

Summary Vaccine injection site reactions are common, but understanding their symptoms, types, and treatment options helps ensure a smoother vaccination experience

Esposito G, Dottori L, Pivetta G, et al

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Any statements regarding therapeutic use have not been evaluated by the FDA.

Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements

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