How Often Should You Get B12 Injections? Infusion For Health What is Vitamin B12 , Vitamin B12 is needed to form red blood cells and DNA. It is also a key player in the function and development of brain and nerve cells. Vitamin B12 binds to the protein in the Anemia: Causes, Symptoms, Diagnosis, Treatments B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Iron deficiency and B12 deficiency both cause anemia. But the treatment is COMPLETELY different. Taking iron for B12 deficiency? Won't work. Taking B12 for iron deficiency? Won't work. Swipe to learn the