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The evidence is sound, and the available human data is real
When taking oral supplements, the most bioavailable form is methylcobalamin
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Restoration of the NAD + levels by niacin, a NAD + precursor and B3 vitamin, provided health benefits, slowly reversing physical performance of some adult patients 15 .To find patients who have NAD + deficiency and could benefit from B3 treatment, we needed to set up validated technology and assess their values in the normal population
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