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Another possibility is that obesity could lower serum vitamin B12 levels through decreased dietary intake or absorption, increased catabolism, and sequestration in adipose tissue, or changes in the gut microbiota profiles which could affect the metabolism of vitamin B12

Researchers often employ controlled handling procedures to support consistency during experimental use

Individual components are recognized nutrients, but that is not the same thing as an approved indication

J., & Chasman, D

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Perturbing status of vitamin B12 in Indian infants and their mothers