B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Vitamin Injections Goddess Aesthetics Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project