Do You Need a Prescription for B12 Injections? OmegaQuant 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 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 How Can Vitamin B12 Shots Help Me Feel Refreshed Dr. Nasseri