B12 Injections: Who Should Get Them and How Long Do They Last? B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Vitamin Injections Goddess Aesthetics Vitamin B12 Deficiency Harvard Health B12 Injection Energy & Cognitive Function Alan Health Medinaz Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and