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Normal serum levels may be found in cases of deficiency where myeloproliferative disorders, liver disease, transcobalamin II, or small intestinal bacterial overgrowth are present
These include: Having trouble absorbing B12 from food because of conditions like pernicious anemia or stomach problems
As vitamin-containing food is digested by hydrochloric acid and pepsin secreted into the stomach, HC binds the vitamin and protects it from acidic degradation
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