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A shortage of vitamin B12 in the body can lead to severe health problems
Unlike most nutrients, B12 requires a protein called intrinsic factor (IF) to be absorbed
Individuals with excess methylation often do not do well with this form
The medication may further reduce absorption of the small amounts obtained from fortified foods
However, in cases of severe nutrient malabsorption and pernicious anemia, injections are more efficient at correcting the deficiency
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