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Intrinsic factor is only made in the stomach and after a gastrectomy there is little to no more of it or gastric acid, and the active mechanism in the body where B12 is absorbed is either less available or not available at all depending on if the surgery was a total or a part of a gastrectomy
Disclaimer All information in this article is provided for educational purposes and describes findings from in vitro, rodent and other preclinical research literature, along with a neutral summary of anecdotal community sentiment
Identification of NAD interacting residues in proteins
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