Vitamin B12 is essential for red blood cell formation, nerve health, and DNA production. Yet, millions of people are deficient without realizing it. The symptoms often appear gradually — and can easily be mistaken for other conditions. Here’s what to watch for: Tingling or Numbness in Hands and Feet A classic sign of nerve damage caused by prolonged deficiency. Muscle Weakness or Balance Problems B12 is crucial for nervous system function — low levels affect coordination and strength. Pale or Jaundiced Skin Without enough B12, red blood cells become fragile, leading to anemia and pale skin. Fatigue and Low Energy Deficiency means your body struggles to transport oxygen efficiently, leaving you exhausted. Mood Changes or Depression B12 helps produce serotonin; low levels can cause mood swings, anxiety, and even depression. Memory Issues and Brain Fog Poor focus and forgetfulness may be linked to reduced oxygen flow to the brain. Swollen, Red Tongue Known as glossitis , it’s a commo...