That's why the Office of Dietary Supplements states that people over 50 should gain most of their B12 from dietary supplements or fortified foods
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Intrinsic factor binds to the separated B12 and carries it to the intestines, where it is absorbed by our body
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There has not been a UL (upper intake level) established for B12 because it is not stored in your body and therefore, can not build up enough to cause serious adverse side effects for most people