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Lyophilized powder that has turned yellow or clumped unevenly may also indicate degradation, though HPLC testing is the only reliable method
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Most experienced users recommend starting at 0.25 mg daily for the first week, then increasing to 0.5 mg daily if well tolerated and additional benefit seems likely
Injections are very effective at raising blood levels of vitamin B12 and preventing or reversing a B12 deficiency
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