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 Pernicious Anemia: Definition, Symptoms, Causes & Treatment B12 level 99 ng L. Is this really low or just a little low? How often for injections? : r B12_Deficiency Vitamin B12 Shots in Canton, MI: What You Need to Know Everything You Need to Know About Vitamin B12 Injections