Summary
The long-term vitamin requirements of men (n=22) with moderate hyperhomocysteinemia (plasma total homocysteine concentration > 16.3 μmol/1) were investigated over a period of 48 weeks. An initial 6-week period of vitamin supplementation (1.0 mg folic acid, 10 mg pyridoxine, 0.05 mg cyanocobalamin) reduced plasma homocysteine levels 54.7% (P<0.001). However, 18 weeks after vitamin therapy was discontinued, only seven participants (subgroup A) still had plasma homocysteine levels of 16.3 μmol/l or lower. The remainder of the participants (subgroup B) required a second 6-week period of vitamin therapy to normalize the elevated plasma homocysteine levels. Substitution of vitamin supplementation by dietary guidelines to increase folate intake from food products failed to maintain normal plasma homocysteine levels in participants from subgroup B. Long-term vitamin supplementation may be required in some individuals to prevent hyperhomo-cysteinemia.
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Abbreviations
- HPLC:
-
high-performance liquid chromatography
- Lp(a):
-
lipoprotein(a)
- PLP:
-
pyridoxal 5′-phosphate
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Ubbink, J.B., van der Merwe, A., Vermaak, W.J.H. et al. Hyperhomocysteinemia and the response to vitamin supplementation. Clin Investig 71, 993–998 (1993). https://doi.org/10.1007/BF00180030
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DOI: https://doi.org/10.1007/BF00180030