If I took vitamin B12 injections and folic acid along with magnesium, a B complex, and carnitine, but there was no improvement and my condition actually worsened with increased anxiety, does this mean 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: Signs & Symptoms Vitamin B12 is essential for nerve health, red blood cell formation, and brain function. When B12 levels are low, symptoms often develop slowly and silently, How's Your Vitamin B 12 Level? B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital