HomocysteineHyperhomocysteinemiaVitamin B 12Folic AcidVitamin B ComplexVitamin B 6Methylenetetrahydrofolate Reductase (NADPH2)Vitamin B 12 DeficiencyOxidoreductases Acting on CH-NH Group DonorsMethylmalonic AcidMethionineRisk FactorsNutritional StatusDietBiological MarkersCase-Control StudiesSerumCardiovascular DiseasesHomocystineCystathionine beta-SynthaseBetaine-Homocysteine S-MethyltransferaseCystathionine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseSerum AlbuminS-AdenosylhomocysteineHomocystinuriaFolic Acid DeficiencyBetaineS-AdenosylmethioninePyridoxineHomocysteine S-MethyltransferaseDietary Supplements5,10-Methylenetetrahydrofolate Reductase (FADH2)Glycine N-MethyltransferaseTetrahydrofolatesCysteineSerum Albumin, BovineTranscobalaminsAdenosylhomocysteinaseVitamin B DeficiencyVitamin B 6 DeficiencyReference ValuesGenotypeSarcosineCreatinineMethylationTime FactorsCystathionine gamma-LyasePolymorphism, GeneticFastingLiverPyridoxal PhosphateLipotropic AgentsVascular DiseasesProspective StudiesBlood ProteinsLipidsCholesterolDose-Response Relationship, DrugEnzyme-Linked Immunosorbent AssayChromatography, High Pressure LiquidC-Reactive ProteinFluorescence Polarization ImmunoassayVitamins