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It is given under a doctors prescription either in the outpatient setting or at your home
the methyl group at the 1-position and the amino group at the 5-position appear important for inhibitory activity
Warnings and Precautions Hypokalemia: B12 therapy may cause a drop in potassium levels (hypokalemia), particularly during early treatment in patients with significant B12 deficiency
In powder form, however, the B12 can last for years
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