Feeling tired all the time, tingling in your hands or feet, poor concentration, or burning feet could be signs of Vitamin B12 deficiency. Early diagnosis and proper treatment can help protect your Vitamin B12 Deficiency: Signs & Symptoms Vitamin B12 is essential for nerve health, red blood cell formation, and brain function. When B12 levels are low, symptoms often develop slowly and silently, Are Vitamin B12 Shots Right for You? Still feeling tired even after good sleep? It might be more than just stress it could be Vitamin B12 deficiency., In Part 2, Dr. Pydi Satish, Consultant General Physician, explains the signs, causes,