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Things like aging, certain health conditions, or even some medications can make it difficult for your body to use the B12 from your food
It is a small organic molecule built on a quinolinium ring system, catalogued in PubChem as CID 950107 for the cation, with the formula C10H11N2 for the free cation and a molecular weight near 159.2
poor nutrition or vegan diet) Transcobalamin II deficiency It is also used as part of the vitamin B12 absorption test (Schilling test)
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