Vitamin B12 deficiency anemia - MedlinePlus
https://medlineplus.gov/ency/article/000574.htm
WebVitamin B12 deficiency anemia is a low red blood cell count due to a lack (deficiency) of vitamin B12. Causes. Your body needs vitamin B12 to make red blood cells. In order to provide vitamin B12 to your cells: You must eat foods that contain vitamin B12, such as meat, poultry, shellfish, eggs, fortified breakfast cereals, and dairy products.
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