Vitamin B12 Injection Dose for Adults: 7 Key Facts on Dosage & Frequency Liv Hospital Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Vitamin B12 Injection at BiosenseClinic.com a Licensed Pharmacy 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 CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL VITAMIN B12 INJECTION 1000 mcg mL