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Absorption actually takes place in the small intestine and requires the presence of a special protein produced by the cells in the stomach called intrinsic factor

The latter two are often elevated with B12 deficiency (MMA is especially predictive) while emerging evidence suggests that holotranscobalamin better reflects your B12 status than serum levels, says Miller, since it measures how much of the nutrient is actually being delivered to the tissues of your body

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If you have severe or strange symptoms, see a doctor

(PubMed) Violi F, Pignatelli P