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Nikel IP, Pettinari MJ, Galvagno MA, Mndez BS
If vitamin B12 is ingested in its free (or nonprotein bound form), it will bind to a carrier protein known as R-binders or transcobalamin I that is secreted by both the salivary glands in the oropharynx and the gastric mucosal cells within the stomach.1,2,8 The free vitamin B12 ingested by mouth will remain in the bound form with an R-binder until it reaches the second segment of the duodenum in the small intestine
This allows for a dose-dependent relationship to be established, as well as allowing the authors to gauge what dosages will affect micro vs macro level measurements
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Singh, M., & Das, R
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