ivee Vitamin B Complex Injection vs Oral Supplement 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 Vitamin B12 Dosages: Your GoodRx Guide GoodRx Vitamin Injections vs. Oral Supplements: What's the Difference? Vital Flow Infusions Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project