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Description
In vitro studies show that downstream markers can vary sharply across cell type and tissue context, which is why reproducible sourcing and storage matter at the procurement stage
National Institutes of Health Vitamin B12 2
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Stomach acid is necessary for making Vitamin B12 available from food

It acts as an inhibitor of nicotinamide N-methyltransferase (NNMT), a crucial enzyme involved in energy metabolism and fat storage