Scientists Just Found a Major Problem With Vitamin B12 Guidelines And Your Brain Might Be at Risk How's Your Vitamin B 12 Level? Have You Seen Anemia Cases Not Responding to Iron Therapy? Why Anemia Is Often Misdiagnosed Anemia is not a single disease. Treating every low hemoglobin as iron deficiency leads to missed Vitamin B12 Deficiency: Vitamin B12 deficiency is a nutritional or absorption related disorder leading to impaired DNA synthesis and neurologic dysfunction, commonly presenting with megaloblastic anemia and neuropsychiatric symptoms. Physiological