Unusual FatigueFeeling tired even after a full night’s sleep? Vitamin B12 is essential for oxygen delivery in the blood. A lack of it means your body doesn’t get enough oxygen—leaving you drained, weak, and sluggish. Tingling or Numbness in Hands and Feet A pins-and-needles sensation in your extremities can signal nerve damage caused by prolonged B12 deficiency. This symptom is often one of the earliest and most alarming red flags. Pale or Jaundiced Skin Vitamin B12 helps the body produce healthy red blood cells. Without it, your skin may appear pale, or even slightly yellow due to broken red blood cells releasing bilirubin. Memory Problems or Brain Fog

Struggling to focus? Forgetting things often? B12 is vital for brain health. Low levels can affect cognition, causing memory lapses and difficulties with concentration. Mood Changes or Depression Studies suggest a link between low B12 levels and mood disorders like anxiety and depression. The vitamin helps produce serotonin, a chemical responsible for mood regulation. Shortness of Breath or Dizziness