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Testosterone therapy has potential side effects that require monitoring through regular blood work and exams
People who are unable to absorb vitamin B-12 properly may have pernicious anemia, which is a type of anemia characterized by a lack of intrinsic factor
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Bacterial overgrowth syndrome may cause cobalamin deficiency because of competition for cobalamin in the intestine before the "cobalamin-intrinsic factor" complex reaches the terminal ileum
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