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There is also recent data which suggest that genetic alterations of the receptor by which B12 is transported into nerve tissue and the brain, may lead to a lower B12 uptake
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Vitamins B6 and B12, for example, are specifically required for the production of healthy red blood cells and for nervous system health, respectively
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Testing MTHFR and other relevant genetic markers can identify these individuals, though routine genetic testing for b12 supplementation decisions remains controversial
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