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Dirty needles can spread deadly blood-borne diseases like hepatitis and HIV
Remember that vitamin B12 must attach to a protein called intrinsic factor, which is secreted in the stomach to be absorbed
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The reason the vitamin works so well is that it encourages the production of white blood cells and, once produced, protects them from harm
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However, some people have difficulty absorbing vitamin B12 from their diet, including dietary restrictions, certain medical conditions like pernicious anemia, or medications that interfere with B12 absorption
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