Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff Vitamin B12: How Frequently Should I Get It? URBAN Medical Fishersville, VA and Gilbert, AZ What are Vitamin B12 injections Vitamin B12 injections are used to quickly raise your B12 levels when they're low or when your body can't absorb it properly from food or tablets. What Vitamin B12 Trio Sandoz Vitamin B12 Injectable Solution 1000 mcg 10 mL Vitamin B12 Cyanocobalamin 1,000 mcg mL 10 mL Multiple Dose Vial 10 Box