HomocysteineFolic AcidMethionine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseVitamin B 12MethylationHyperhomocysteinemiaBetaine-Homocysteine S-MethyltransferaseMethylenetetrahydrofolate Reductase (NADPH2)CystathionineGlycine N-MethyltransferaseFolic Acid DeficiencyCystathionine beta-SynthaseVitamin B 6Vitamin B 6 DeficiencyBetaineS-Adenosylhomocysteine5,10-Methylenetetrahydrofolate Reductase (FADH2)Oxidoreductases Acting on CH-NH Group DonorsS-AdenosylmethionineTetrahydrofolatesHomocystineGlycine HydroxymethyltransferaseDNA MethylationPyridoxal PhosphateVitamin B ComplexSerineAzacitidineCarbon IsotopesHomocystinuriaDeuteriumVitamin B 12 DeficiencyLeucineCarbonAmino AcidsMethylmalonic AcidLiverHomocysteine S-MethyltransferasePyridoxineCysteineDietary SupplementsKineticsRisk FactorsAdenosylhomocysteinaseVitamin B DeficiencyTranscobalaminsSarcosineCystathionine gamma-LyaseBiological MarkersGenotypeLipotropic AgentsCardiovascular DiseasesPolymorphism, GeneticVascular DiseasesCysteic AcidCase-Control StudiesDietMethylenetetrahydrofolate Dehydrogenase (NAD+)FastingMethyltransferasesPhosphatidylethanolamine N-MethyltransferaseFluorescence Polarization ImmunoassaySulfhydryl CompoundsEndothelium, VascularCholineFerredoxin-NADP ReductaseNeural Tube DefectsReference ValuesRiboflavinAmino Acids, SulfurVitaminsNutritional StatusSulfurFood, FortifiedTubercidinCreatinineArteriosclerosisHematinicsDipeptidesMethionine-tRNA LigaseDose-Response Relationship, DrugCopper SulfateDouble-Blind MethodGuanidinoacetate N-MethyltransferaseMethylenetetrahydrofolate Dehydrogenase (NADP)Chromatography, High Pressure LiquidGlutathioneHomozygoteCross-Sectional StudiesNicotinamide N-MethyltransferaseLipoprotein(a)CoffeeProspective StudiesCholine DeficiencyC-Reactive ProteinOxidative StressRegression AnalysisMethionine AdenosyltransferaseAnalysis of VarianceKidney Failure, Chronic