Still feeling tired even after good sleep? It might be more than just stress it could be Vitamin B12 deficiency., In Part 2, Dr. Pydi Satish, Consultant General Physician, explains the signs, causes, Are B12 Injections Safe? Should I Get A B12 Shot? B12 Injection When Is It Worth It and What Can You Feel After One Dose? LondonMassage4U Benefits of Vitamin B12 Shots Complete Health Partners Vitamin B12 is required for the function and development of many parts of the body, including the brain, nerves, and blood cells Since your body doesn 't make vitamin B12, you have to Vitamin b12 injections I'm regularly asked whats the point in having them? Vitamin b12 is formally found in the foods we eat but studies show a large number of adults