Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital Cyanocobalamin vs Hydroxocobalamin (Vitamin B12 forms) Key Clinical Differences Hydroxocobalamin is preferred in: Pernicious anemia Severe vitamin B12 deficiency Neurological symptoms (subacute combined degeneration, neuropathy) Cyanocobalamin is How Long Does Vitamin B12 Take to Work? Timeline & Signs Performance Lab How to Give a B12 Injection: Step By Step Instructions Vitamin B12 (cobalamin) and folate (vitamin B9) are vitamins that serve important functions in the human body. Folate is needed for development and growth of cells (including red blood cells) and synthesis