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In people without pernicious anemia, about 0.5 g/day of B12 is reabsorbed by enterohepatic circulation in which B12-containing bile is secreted by the liver into the digestive tract where the B12 is then reabsorbed via intrinsic factor
High Vitamin B12 Levels in Women High vitamin B12 levels in women are often due to supplements or diets rich in this vitamin
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Vitamin B 12 deficiency can develop for the following reasons: Absence of intrinsic factor, also called pernicious anemia: Intrinsic factor is a protein secreted by cells of the stomach lining
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