Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Best Vitamin B12 Injections Dosage And Frequency PA Relief Vitamin B12 and the Vegan Diet Today's Dietitian Magazine 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 Methylcobalamin Injection (Vitamin B12) Empower Pharmacy