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Description
Science 329, 841845

10.1038/s41598-017-11960-0 34 CaliM.GantenbeinB.EgliM.PovedaL.IlleF

For those managing a diagnosed deficiency, ongoing treatments may be recommended on a consistent schedule

So even though your 10mg vial contains 40 weeks of 0.25mg doses mathematically, you can not keep using the same reconstituted vial for 40 weeks
10.1016/j.ddmod.2012.02.001 19 FeeW

Pyridoxine and Methylcobalamin are generally considered safe in pregnancy when used appropriately, but medical supervision is essential