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NHLBI, NIH
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Anemia - Vitamin B12–Deficiency Anemia | NHLBI, NIH
https://www.nhlbi.nih.gov/health/anemia/vitamin-b12-deficiency-anemia
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Vitamin B12–deficiency anemia develops when your body can't make enough healthy red blood cells because it doesn't have enough vitamin B12. Learn about its’ causes, symptoms, and treatments.