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Several studies have indicated that the efficacy of oral vitamin B12 supplements is comparable to that of vitamin B12 injections
doi:10.1152/ajpendo.2000.279.3.E501 Ng FM, Sun J, Sharma L, Libinaka R, Jiang WJ, Gianello R
Some may require more frequent doses initially, especially when correcting a deficiency, before moving to a maintenance routine
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Factors such as the form of B12 used, additional ingredients, and manufacturing standards should be considered
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Its especially helpful if you want a more steady boost between appointments
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