Vitamin B12 Injections and Their Benefits Vitamin B12 injections are a highly effective method of delivering vitamin B12 directly into the bloodstream. Vitamin B12 is an essential nutrient that plays a crucial What Happens If You Inject B12 Wrong: 6 Red Flags CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL How Quickly Does B12 Shot Work? Does It Help to Lose Weight? Vitamin B 12 intramuscular injections are also used therapeutically to help restore energy and combat various symptoms related to such deficiencies. Vitamin B 12 is essential to the development of healthy blood cells, nerve