Hydroxocobalamin (B12) 1000mcg mL Injection 30mL MDV McGuff B12 Injection Dosage and Frequency: 7 Essential Guidelines for Adults Liv Hospital What is the recommended dose for a monthly vitamin B12 (cobalamin) injection ? CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. Vitamin B12 Injections Dosage and Frequency IVBoost