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Because preservative effectiveness is only required to be demonstrated for 28 days after first entry, standard multiple-dose vial practice, reflected in CDC injection safety guidance, is to date the vial at first puncture and discard it 28 days later
However, for patients without a true vitamin B12 deficiency, research shows that B12 injections are unlikely to boost energy or reduce fatigue
After receiving your injections, rest up whenever your body tells you to
With IV infusion, your body absorbs nearly 100% of the vitamin, meaning you feel the benefits almost immediately
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