(i) Folate and vitamin B12 deficiencies were observed in 10% and 6% respectively of our unsupplemented dialysis patients. (ii) After folate therapy, tHcy levels decreased significantly in all patients and were identical between the three C677T MTHFR genotype subgroups. (iii) Vitamin B12 supplements are useful in folate treated patients to prevent cobalamin deficiency and its neurological consequences but they did not lower tHcy plasma levels for the patients as a group or for any of the MTHFR subgroups.
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Billion et al. (2002) studied this question.
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