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 B12 Injections vs Oral Supplements: Which are more effective? Volonte Vitamin B12 Injections vs. Oral Supplements: Which Is Better? Vital Force IV Therapy Compounded Hydroxocobalamin (Vitamin B12) Injection The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine