Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff 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 Vitamin B12 Deficiency Symptoms On The Go B12 Injection at enTrust Urgent Care Center Clinic MIC B12 Injections Before and After Clinical Insights for Providers Hubmed B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics