B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injection Dosage Duluth GA B12 Shots & B12 Injections: The Good, Bad and Alternative! How Long Does It Take to Recover from Vitamin B12 Deficiency? Medinaz Vitamin B12 Deficiency: Vitamin B12 deficiency is a nutritional or absorption related disorder leading to impaired DNA synthesis and neurologic dysfunction, commonly presenting with megaloblastic anemia and neuropsychiatric symptoms