HomocysteineHyperhomocysteinemiaFolic AcidVitamin B 12Risk FactorsHomocystineMethylenetetrahydrofolate Reductase (NADPH2)Betaine-Homocysteine S-MethyltransferaseCystathionine beta-SynthaseOxidoreductases Acting on CH-NH Group DonorsVitamin B ComplexVitamin B 6Methionine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseBetaineFolic Acid DeficiencyS-AdenosylhomocysteinePyridoxineHomocystinuriaPlasmaDietary SupplementsS-AdenosylmethionineVitamin B 12 DeficiencyLipotropic AgentsCystathionineCase-Control StudiesGenotypeVitamin B 6 DeficiencyCardiovascular DiseasesMethylmalonic AcidBiological Markers5,10-Methylenetetrahydrofolate Reductase (FADH2)SarcosinePolymorphism, GeneticTetrahydrofolatesFastingGlycine N-MethyltransferaseProspective StudiesDietCross-Sectional StudiesMethylenetetrahydrofolate Dehydrogenase (NADP)Time FactorsVitamin B DeficiencyDouble-Blind MethodSarcosine DehydrogenaseCohort StudiesReference ValuesCysteineRegression AnalysisNicotinamide N-MethyltransferaseVascular DiseasesCholineAnalysis of VarianceCreatininePyridoxal PhosphateOdds RatioAge FactorsGuanidinoacetate N-MethyltransferaseCoronary DiseaseHematinicsPhosphatidylethanolamine N-MethyltransferaseCholine DeficiencyArteriosclerosisCholesterolMultivariate AnalysisFollow-Up StudiesVitaminsChromatography, High Pressure LiquidLipidsFluorescence Polarization ImmunoassayLiverSmokingSex FactorsNutritional StatusNeural Tube DefectsCholesterol, HDLLogistic ModelsIncidencePlasma CellsBody Mass IndexPrevalenceRiboflavinMethylationFerredoxin-NADP ReductaseDose-Response Relationship, DrugTriglyceridesRisk AssessmentMethyltransferasesBlood PressureEndothelium, VascularKidney Failure, ChronicXanthurenatesCoronary Artery DiseaseRenal DialysisCoffeeBlood GlucoseCross-Over StudiesStrokeHomozygoteHLA-B51 Antigen