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Food sources of this vitamin include eggs red meat poultry seafood milk yogurt fortified cereals However, individuals taking medications that affect B12 absorption and people who are pregnant or nursing should consider talking with a doctor before taking a supplement

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Missing or vague documentation can lead to incorrect diagnosis codes, which may result in denied insurance claims or inadequate treatment authorization

doi: 10.1073/pnas.1915309116 193 SathiyamoorthyK.HuY