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What are Vitamin B12
Careau V, Halsey LG, Pontzer H, et al

Critical for treating anaphylactic shock, severe asthma attacks, and life-threatening allergic reactions when IV administration is required

doi: 10.1016/j.drudis.2007.08.010

A vitamin B12 injection delivers hydroxocobalamin a coenzyme form of B12 directly into the muscle tissue as an intramuscular injection, typically into the upper arm