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Description
A B12 shot is a quick intramuscular injection of vitamin B12 (cobalamin) that bypasses the stomach acid, liver metabolism, and intestinal absorption issues that limit oral B12 to roughly 1% bioavailability in most adults

As a result, it should be used with caution

10.1038/s41598-018-30426-5 [DOI] [PMC free article] [PubMed] [Google Scholar] Cienfuegos J

Post Authorization Experience Severe allergic reactions, including anaphylaxis, have been reported following administration of the Pfizer-BioNTech COVID-19 Vaccine
