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5-Methyltetrahydrofolic acid is a biologically active form of folic acid that functions, in conjunction with vitamin B12, as a methyl-group donor involved in the conversion of homocysteine to methionine.1,2 The availability of methyl groups is essential for a variety of methylation reactions including the synthesis of DNA and proper neural tube closure.1 It has been used to restore nitric oxide-generating activity in cases of familial hypercholesterolemia or hyperhomocysteinemia, reducing homocysteine levels and improving vascular endothelial function.3,4

1.Blom, H.J., and Smulders, Y.Overview of homocysteine and folate metabolism. With special references to cardiovascular disease and neural tube defectsJ.Inherit.Metab.Dis.34(1)75-81(2011) 2.5-Methyltetrahydrofolate. MonographAltern.Med.Rev.11(4)330-337(2006) 3.Verhaar, M.C., Wever, R.M.F., Kastelein, J.J.P., et al.5-Methyltetrahydrofolate, the active form of folic acid, restores endothelial function in familial hypercholesterolemiaCirculation97237-241(1998) 4.Zhang, X., Li, H., Jin, H., et al.Effects of homocysteine on endothelial nitric oxide productionAmerican Journal of Physiology.Renal Physiology279(4)671-678(2000)

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