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The same source also indicates that injectable B12 reliably restores levels when oral absorption is impaired

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Their availability and procurement methods are also distinct

Requirements of vitamin B12 in excess of normal (due to pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, hepatic and renal disease) can usually be met with oral supplementation

As a membrane receptor, CD38 recognizes PECAM-1 (CD31), a constitutive marker for vascular endothelial cells