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Vitamin B12 (cobalamin) injections are a form of intramuscular treatment used to rapidly restore and maintain adequate B12 levels in the body

[DOI] [PubMed] [Google Scholar] 54

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B12 injections are often preferred, especially in cases of malabsorption (where your body struggles to absorb B12 from food or tablets), as they deliver the vitamin directly into your bloodstream, bypassing any gut issues