Not a drug, food, cosmetic, or dietary supplement
There are four main types of vitamin B12methylcobalamin, adenosylcobalamin, hydroxocobalamin, and cyanocobalamineach offering unique benefits and varying levels of bioavailability
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Those two figures are not interchangeable the 50 mg vials dose is roughly 17 larger so a dose is always drawn against the concentration of the specific vial in front of you, never carried over from one vial size to another
Some more tech stuff below, for the experienced or just more curious readers
N Engl J Med (2013) 368(2):14960.10.1056/NEJMcp1113996 3 BerlinHBerlinRBranteG