B12 Shots for Energy: Do They Work, Who Needs Them & What to Expect Greenwich Medical Spa When Should You Get a Vitamin B12 Injection? Soza Clinic 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 B12 Shots vs. IV Infusions: What is the difference? Integrative Medicine, Laser and Aesthetics