Vitamin B12 deficiency, sometimes called cobalamin deficiency, happens when your body is either not getting enough or not absorbing enough vitamin B12 from the foods you eat. Vitamin B12 is an important Why Do You Need B12 Injections? PA Relief Vitamin B12 Injections: Benefits and Risks Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics