B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics 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 Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL Vitamin B Complex: Package Insert Prescribing Information Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project