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When doctors do prescribe injections, its usually not nearly enough

Forms of B12 supplements available include: Cyanocobalamin : The most common and cost-effective form in over-the-counter supplements Methylcobalamin : A naturally occurring form, often marketed as superior though evidence for clinical advantage is limited Hydroxocobalamin : The preferred form for intramuscular injection in the UK, used therapeutically for pernicious anaemia and confirmed deficiency [4] Dosing considerations depend on the indication

Am J Trop Med Hyg 77: 181192

Side effects from too much Vitamin B12 can include: How quickly does Vitamin B12 work