Cyanocobalamin Injection: Vitamin B12 Deficiency Relief Mountainside Medical A B12 shot might be just what you need if, youre feeling constantly tired, sluggish, or mentally foggy. This essential vitamin plays a key role in energy production, metabolism, and cognitive The Benefits of B12 Injections B12 Shots for Energy: Do They Work, Who Needs Them & What to Expect Greenwich Medical Spa What does a B12 injection do?