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Vitamin B-12 injections are administered to elevate B-12 levels in individuals who are deficient
There are biochemical reasons that suggest an intramuscular (IM) injection delivers hydroxocobalamin to the bloodstream more rapidly and potentially more effectively than the subcutaneous (SC) route
Methylcobalamin is the active coenzyme form of B12, while cyanocobalamin is a synthetic form requiring conversion in the liver
Neither choice is universally right
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