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When investigating elevated B12, additional tests such as active B12 (holotranscobalamin), methylmalonic acid, and homocysteine may help clarify true B12 status
Supplementary Materials Rights and permissions About this article Cite this article Li, X., Yan, W., Li, J
Pediatr Nephrol 28:5159
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In order to maintain a steady supply of glucose, glucagon strongly stimulates glycogenolysis and suppresses glycogenesis in the liver [28, 29]
Even with B12 in the diet, absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age and with certain medications
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