Depression + Neurological Conditions: Can Vitamin B12 Deficiency Be the Root Cause? Mood + Brain HealthNerve Health Depression + Neurological Conditions: Can Vitamin B12 Deficiency Be the Root Cause? A B12 deficiency often goes undiagnosed. That's because the symptoms of Vitamin B12 deficiency can…Janet Zarowitz, MS, RD, CDNMarch 15, 2019