B12 Injections: What's the Buzz? Vitamin B12 is the star of several essential functions in the body. However, it's common to be deficient in B12 and as a consequence experience fatigue, 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 Injection Side Effects and Safety Benefits of B12 Injections for Optimal Health B12 Shots in Friso, Sherman, Anna. and Sunnyvale, TX B12 THRIVE