Vitamin B12 (cobalamin) deficiency in elderly patients CMAJ What are the benefits of B12 injection? Blades Wellness Vitamin Injections Des Plaines, IL Vitamin Deficiency Treatment Vitamin B12 injections offer several health benefits, including increased energy levels, improved mood, and better cognitive function. They can also support a healthy nervous system, cardiovascular health, and help prevent anemia. Additionally, How Quickly Does B12 Shot Work? Does It Help to Lose Weight?