Vitamin B12 Deficiency: Causes, Symptoms, and Treatment If you've been feeling run down lately you could be deficient in Vitamin B12. Physical symptoms of B12 deficiency include mouth ulcers, fatigue, digestive issues and muscle aches. There are also neurological 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 Vitamin B12 Shots Specialist Near Me in Canton, MI