HomocysteineVitamin B 12Folic AcidHyperhomocysteinemiaVitamin B ComplexMethylenetetrahydrofolate Reductase (NADPH2)Vitamin B 6HomocystineOxidoreductases Acting on CH-NH Group DonorsMethionineVitamin B 12 DeficiencyCystathionine beta-SynthaseMethylmalonic AcidBetaine-Homocysteine S-MethyltransferaseLipotropic AgentsBetaineRisk FactorsPyridoxine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseDietFolic Acid DeficiencyNutritional StatusDietary SupplementsS-AdenosylhomocysteineGlycine N-MethyltransferaseBiological MarkersVitamin B 6 DeficiencyCardiovascular DiseasesCase-Control StudiesFood, FortifiedTranscobalaminsHomocystinuriaS-Adenosylmethionine5,10-Methylenetetrahydrofolate Reductase (FADH2)CholineXanthurenatesSerumFerredoxin-NADP ReductaseNutrigenomicsCoffeeBeerGenotypeVitaminsPolymorphism, GeneticTetrahydrofolatesSarcosineCaseinsFastingCholine DeficiencyDouble-Blind MethodNeural Tube DefectsPyridoxal PhosphateReference ValuesCysteineCystathionineNutrition SurveysVascular DiseasesCereals