What is vitamin B12–deficiency anemia?
Vitamin B12–deficiency anemia, also known as cobalamin deficiency, is a condition that develops when your body can’t make enough healthy red blood cells because it doesn’t have enough vitamin B12.
Your body needs vitamin B12 to make healthy red blood cells , white blood cells , and platelets . Since your body doesn’t make vitamin B12, you have to get it from the foods you eat or from supplements.
You can get vitamin B12 deficiency if you can’t absorb vitamin B12 due to problems with your gut or if you have pernicious anemia, which makes it difficult to absorb vitamin B12 from your intestines.
Without enough vitamin B12, blood cells do not form properly inside your bone marrow, the sponge-like tissue within your bones. These blood cells die sooner than normal, leading to anemia.
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