Who Needs B12 Injections, How Much and How Often? InVita Wellness 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 In a patient receiving vitamin B12 injections who has a serum B12 level of 1230 pg mL (reference range up to 771 pg mL), should the injection dose be reduced or is the elevated Who Needs B12 Injections, How Much and How Often? InVita Wellness