Vitamin B12, or cyanocolbalamin, is essential to growth, cell reproduction, hematopoiesis, and nucleoprotein and myelin synthesis
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However, once a multi-dose pen is first used, the in-use period (discussed in the next section) takes precedence over the printed expiration date
However, this effect was not observed in the extended-access paradigm
This complementary kinetic profile is one reason the two peptides are commonly co-administered in tissue repair research