metformin and b12 injections How Causes Vitamin deficiency? Metformin users at risk for
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Archived from the original on 18 May 2021
The choice between cyanocobalamin and hydroxocobalamin might also depend on the neurological symptoms

Talaei A, Siavash M, Majidi H, Chehrei A

[1] [2] This rapidly replenishes depleted B12 stores and corrects anaemia

doi:10.1631/jzus.B1700117
Do oral B12 supplements work as quickly as injections