The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that B12 Shots: Vitamin B12 Injections Benefits, Uses, Risks Dr. Axe Main benefits of B12 injections 1) Increased energy & reduced fatigue B12 helps convert food into usable energy Deficiency often causes tiredness, weakness, and low stamina 2) Healthy red blood cells Prevents