low potassium after b12 injections Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12 Injections: Benefits, Risks,
Description
2015 Jun;48(6):e11-26

Vitamin B12 injection IV or IM searches are common, but intravenous use should not be assumed unless a clinician specifically directs it
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Targeting CD38 Suppresses Induction and Function of T Regulatory Cells to Mitigate Immunosuppression in Multiple Myeloma

Also, this is sometimes used in people with diabetes, pernicious anemia, and other conditions
