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Folate metabolism is an important target for drug therapy. Drug-induced inhibition of folate metabolism often causes an elevation of plasma total homocysteine (tHcy). Plasma tHcy levels are influenced by several nongenetic (e.g. folate intake, age, smoking) as well as genetic factors. Over the last decade, several countries have implemented a nationwide folate fortification program of all grain products. This investigation sought to determine the impact of folate fortification on the relative contribution of environmental and genetic factors to the variability of plasma tHcy.

Genetic and environmental determinants of plasma total homocysteine levels