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Marcuard SP, Sinar DR, Swanson MS, Silverman JF, Levine JS
Research shows this dose works well to fix deficiency and reduce symptoms like tiredness, weakness, and nerve problems
Unlike oral medications, which must travel throughout the body before taking effect, injections act locally and quickly
Their quality or safety may be compromised
For those with a genuine, diagnosed B12 deficiency causing their fatigue, improvements can sometimes be noticed within a few days to a week
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