B-12 injections contain high levels of cyanocobalamin. B-12 is an injection designed to increase your energy levels and overall physical activity.  Vitamin B-12 helps your body use its own fat and carbohydrates to make both energy and protein. You will experience improvement in your energy level if your diet does not encompass B-12 as it should. Overall, if you are deficient in vitamin B-12, then these injections are going to help you raise your blood levels, and improve your overall health.