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 B 12 Injectable for Horses, Dogs and Cats Jeffers 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. Compounded Cyanocobalamin (Vitamin B12) Injection Empower B12 Injection Dose: 7 Key Guidelines for Adults and Common Prescriptions Liv Hospital