HomocysteineFolic AcidHyperhomocysteinemiaVitamin B 12Vitamin B ComplexMethylenetetrahydrofolate Reductase (NADPH2)Oxidoreductases Acting on CH-NH Group DonorsVitamin B 12 DeficiencyFolic Acid DeficiencyPyridoxineRiboflavinPlasmaFood, FortifiedMethionineFastingDietary SupplementsGenotypeErythrocytesCreatinineRisk FactorsDietPlasma CellsMethylmalonic AcidVitamin B 6Cell MembranePlasma GasesMethylenetetrahydrofolate Dehydrogenase (NAD+)Plasma VolumeBiological MarkersHomocystinePlasma ExchangeFluorescence Polarization ImmunoassayChromatography, High Pressure LiquidCystathionine beta-SynthaseCholesterolBetaineTime FactorsReference ValuesLipidsCystathionineTriglyceridesSarcosineLiverCross-Over StudiesCase-Control StudiesBlood GlucoseDose-Response Relationship, DrugPlatelet-Rich PlasmaVitaminsTranscobalaminsLipoproteinsNutritional StatusInsulinCoffeeTetrahydrofolatesPregnancySerum AlbuminRadioimmunoassayPolymorphism, GeneticRenal DialysisCerealsDouble-Blind MethodProspective StudiesOsmolar ConcentrationPyridoxal PhosphateRegression AnalysisS-AdenosylhomocysteineKidney Failure, ChronicLeukemia, Plasma CellBlood PressureAnalysis of VarianceArea Under CurveBiological TransportCysteineSemenMembrane ProteinsCross-Sectional StudiesReninKidneyMetabolic Clearance RateCholesterol, HDLLinear ModelsPlacebos5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseVascular DiseasesDogsCardiovascular DiseasesCohort StudiesMolecular Sequence Data5,10-Methylenetetrahydrofolate Reductase (FADH2)AgingLipoproteins, HDLBody WeightHydrocortisoneFatty Acids, NonesterifiedArteriosclerosisCholineRats, Sprague-DawleyAmino AcidsFibrinogen