when to give vitamin b12 injections Are Shots Right for You? How to self-inject intramuscular vitamin
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My first thought was what good is B12 going to do !, but after a few months there was a huge improvement

If that weakness comes with weight loss, a poor appetite, or yellowish skin, it's worth having your B12 levels checked by a doctor

Hyperglucagonemia Mitigates the Effect of Metformin on Glucose Production in Prediabetes

doi:10.1038/sj.ejcn.1602351 Jin Q, Chen S, Ji X