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Description
Hydroxocobalamin tends to remain in the body longer and is more readily converted to the active coenzyme forms of B, which can make it effective for maintaining B levels

Allergy to vitamin B12: two cases of successful desensitization with cyanocobalamin
It is available as an oral dietary supplement in tablet form, or doctors can also prescribe it as a shot

The reason why you often need to take vitamin B12 supplements is that it is an essential vitamin