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The evidence is unclear or shows little to no benefit from using B12 supplementation, but more research is needed in these areas
J Neurosci 32(24):81278137 Frisen J, Verge VM, Fried K, Risling M, Persson H, Trotter J, Hoekfelt T, Lindholm D (1993) Characterization of glial trkB receptors: differential response to injury in the central and peripheral nervous systems
Precautions : Selenium can cause adverse reactions if you have an iodine deficiency
Levels may be low, even if all other screening tests for iron and anemia come out within the reference range
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