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, My b12 levels are now great but i still suffer numbness : r B12_Deficiency B12 as a Treatment for Peripheral Neuropathic Pain: A Systematic Review Im Sure Its That #wait, Vitamin B12 deficiency can be surprisingly serious, especially when it comes to the nervous system. Without enough B12, the body struggles to make healthy red blood cells