If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that When Should You Get a Vitamin B12 Injection? Soza Clinic What does a B12 shot do, and how does it affect the body? Vitamin B12 Injections Specialist in Langhorne, PA B12 Injections for Energy: Benefits and How It Works AZ IV Medics