HyperhomocysteinemiaVitamin B 12Folic AcidHomocystineCystathionine beta-SynthaseMethylenetetrahydrofolate Reductase (NADPH2)MethionineVitamin B ComplexVitamin B 6Betaine-Homocysteine S-MethyltransferaseCystathionine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseS-AdenosylhomocysteineHomocystinuriaOxidoreductases Acting on CH-NH Group DonorsBiological MarkersProspective StudiesTime FactorsRisk FactorsVitamin B 12 DeficiencyFolic Acid DeficiencyMethylmalonic AcidDouble-Blind MethodFollow-Up StudiesTreatment OutcomeBetaineS-AdenosylmethionineHomocysteine S-MethyltransferasePyridoxineDietary SupplementsC-Reactive ProteinAnalysis of Variance5,10-Methylenetetrahydrofolate Reductase (FADH2)Cohort StudiesDose-Response Relationship, DrugGlycine N-MethyltransferaseCardiovascular DiseasesBlood PressureCase-Control StudiesTetrahydrofolatesCysteineLongitudinal StudiesReference ValuesGenotypeAdenosylhomocysteinaseDietPredictive Value of TestsVitamin B DeficiencyTranscobalaminsRats, Sprague-DawleyCross-Over StudiesVitamin B 6 DeficiencyRegression AnalysisCreatinineSeverity of Illness IndexEndothelium, VascularSarcosineLinear ModelsMethylationPlacebosCystathionine gamma-LyaseDisease ProgressionPolymorphism, GeneticAgingQuestionnairesPyridoxal PhosphateMultivariate AnalysisDrug Therapy, CombinationFastingLipidsCoronary DiseaseVascular DiseasesCells, CulturedLipotropic AgentsHeart RateKidney Failure, ChronicAdministration, OralCross-Sectional StudiesRNA, MessengerOxidative StressRisk AssessmentDisease Models, AnimalArteriosclerosisBody Mass IndexCholesterolIncidenceRenal DialysisCysteic AcidHemodynamicsLiverPilot ProjectsVitaminsNutritional StatusCholesterol, LDLMethylenetetrahydrofolate Dehydrogenase (NAD+)SmokingPrognosisMethyltransferasesStatistics, NonparametricPhosphatidylethanolamine N-Methyltransferase