Vitamin B12 Shot G Therapy Center Physical Therapy & Massage Doral FL Iron deficiency and B12 deficiency both cause anemia. But the treatment is COMPLETELY different. Taking iron for B12 deficiency? Won't work. Taking B12 for iron deficiency? Won't work. Swipe to learn the Can Fibroids Cause B12 Deficiency? Learn More How To Reduce Heavy Menstrual Bleeding During Periods Causes of heavy menstrual bleeding and when to seek help