Brain Fog or B12? The Hidden Nutrient Deficiency Mimicking Memory Loss

6. Neurological Symptoms of B12 Deficiency
Deficiency in this vitamin is often accompanied by bothersome neurological symptoms. A "pins and needles" sensation (tingling) in the fingers and toes, involuntary tremors, and muscle weakness are early signs. In advanced cases, an individual may struggle with balance while walking due to impaired nerve signaling.