Vitamin B 12Vitamin AVitaminsVitamin DVitamin EHyperhomocysteinemiaFolic AcidVitamin A DeficiencyVitamin B 6Vitamin D DeficiencyVitamin B 12 DeficiencyHomocystineMethylenetetrahydrofolate Reductase (NADPH2)Cystathionine beta-SynthaseVitamin K 1Vitamin B 6 DeficiencyMethionineVitamin E DeficiencyVitamin B ComplexDietary SupplementsCystathioninePyridoxineBetaine-Homocysteine S-Methyltransferase5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseVitamin K DeficiencyAscorbic AcidFolic Acid DeficiencyCholecalciferolS-AdenosylhomocysteineMethylmalonic AcidHomocystinuriaOxidoreductases Acting on CH-NH Group DonorsVitamin B DeficiencyReceptors, CalcitriolVitamin D-Binding ProteinTranscobalaminsDietBetaineS-AdenosylmethionineVitamin K 2Risk FactorsNutritional StatusHomocysteine S-MethyltransferaseCalcifediolPyridoxal PhosphateAntioxidantsCalcitriol5,10-Methylenetetrahydrofolate Reductase (FADH2)TetrahydrofolatesAvitaminosisFood, FortifiedCysteineGlycine N-MethyltransferaseRiboflavinErgocalciferolsBiological MarkersVitamin K 3AdenosylhomocysteinaseVitamin K Deficiency Bleedingalpha-TocopherolCase-Control Studiesbeta CaroteneGenotypeDouble-Blind MethodRicketsSunlightCardiovascular DiseasesPolymorphism, GeneticMethylationSarcosineDose-Response Relationship, DrugLiverCystathionine gamma-LyaseNutritional RequirementsChromatography, High Pressure LiquidReference ValuesVascular DiseasesOxidative StressLipotropic AgentsSodium-Coupled Vitamin C Transporters25-Hydroxyvitamin D3 1-alpha-HydroxylaseFastingNeural Tube DefectsVitamin K Epoxide ReductasesHomocysteineHydroxycholecalciferolsCross-Sectional StudiesProspective StudiesTocopherolsEndothelium, VascularMethylenetetrahydrofolate Dehydrogenase (NAD+)Time FactorsMethyltransferasesMicronutrientsAdministration, Oral25-Hydroxyvitamin D 2Sulfhydryl CompoundsCysteic AcidCarotenoidsParathyroid Hormone