[23] [24] Intracellular vitamin B 12 is maintained in two active coenzymes, methylcobalamin and adenosylcobalamin
This is because issues with regular function of the gastrointestinal tract can prevent the proper release and absorption of the vitamin which causes deficiency
The answer depends on whether youll inject subcutaneously (SQ) or intramuscularly (IM)
References: National Institutes of Health, Office of Dietary Supplements
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