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However, there is good evidence that, although folic acid binds avidly to this receptor in the choroid plexus, it does not cross the opposite, apical membrane to enter the cerebrospinal fluid (CSF) (78)

PMID: 29543316 5 Bioavailability and daily requirement of vitamin B12 in adult humans: an observational study of its colonic absorption and daily excretion as measured by [13C]-cyanocobalamin kinetics

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Unopened vials should be kept in the refrigerator until ready for use

Nutrients 2021;13:395
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