Vitamin B12 Injection Sioux Falls, SD Vital Flow Infusions Boost Energy and Wellness with Rx B12 Injections 10 mg High Dose Vitamin B12 LifespanningRx 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 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. Benefits of B12 Injections for Optimal Health