Vitamin B12 injections have been around for years but do you know who benefits most from them? B12 support may be a great option if you: Feel tired or low on Best Vitamin B12 Injection Site: Administering B12 Shots Vitamin B12 Injection treat harmful anemia plus B 12 insufficiency B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL