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Description
Nausea, mild GI upset, or dizziness (especially with oral or highdose forms)
Bibcode:1984Natur.307..131N
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Importantly, metformin does not completely block vitamin B12 absorption
However, regular intramuscular injections are a significant strain on resources (both time and financial) and are inconvenient for patients, so a trial of oral replacement therapy may be suitable in some cases

10.1016/0003-9861(88)90592-9 13 CoppleI
