Folic AcidVitaminsDietary SupplementsVitamin B ComplexVitamin B 12Vitamin EAvitaminosisVitamin ANeural Tube DefectsHomocysteineAscorbic AcidPreconception Carebeta CarotenePyridoxineFolic Acid DeficiencyVitamin B 6HyperhomocysteinemiaVitamin DMethylmalonic AcidGlutamatesFood, FortifiedAntioxidantsGuanineDouble-Blind MethodVitamin A DeficiencyPrenatal CarePregnancyVitamin D DeficiencyTetrahydrofolatesVitamin B 12 DeficiencyFolic Acid AntagonistsInfant, NewbornVitamin K 1Vitamin E DeficiencyDietCholecalciferolFolate Receptors, GPI-AnchoredAnemia, MacrocyticRisk FactorsHematinicsMicronutrientsVitamin B 6 DeficiencyNutritional StatusVitamin K DeficiencyNutritional RequirementsPrenatal Nutritional Physiological PhenomenaPteroylpolyglutamic AcidsZincAnimal FeedBreadFolic Acid TransportersPlacebosVitamin B DeficiencyRiboflavinMaternal Nutritional Physiological PhenomenaAdministration, OralIronalpha-TocopherolAnemia, Iron-DeficiencyMethylenetetrahydrofolate Reductase (NADPH2)Random AllocationFlourNutrition PolicyReceptors, CalcitriolVitamin D-Binding ProteinIron, DietaryDose-Response Relationship, DrugBiological AvailabilityCalcifediolCerealsFolate Receptor 1MethionineBody WeightErythrocytesVitamin K 2SeleniumTrace ElementsSpinal DysraphismFormyltetrahydrofolatesAnimal Nutritional Physiological PhenomenaAminopterinCalcitriolCalcium, DietaryIntestinal AbsorptionLiverErgocalciferolsLactationTocopherolsCarotenoidsPterinsNepalHomocystineMineralsTime FactorsReduced Folate Carrier ProteinHemoglobinsPregnancy ComplicationsThiamineFIGLU TestPregnancy Complications, Hematologic