Folic AcidVitaminsDietary SupplementsFolic Acid DeficiencyNeural Tube DefectsVitamin B ComplexPreconception CareFood, FortifiedVitamin B 12HomocysteineTetrahydrofolatesFolic Acid AntagonistsMineralsPrenatal CarePregnancyPaulliniaFolate Receptors, GPI-AnchoredDouble-Blind MethodHyperhomocysteinemiaTrace ElementsBiotinMaternal Nutritional Physiological PhenomenaAnemia, MacrocyticNutrition PolicyHematinicsVitamin B 6Vitamin APteroylpolyglutamic AcidsVitamin EMethylenetetrahydrofolate Reductase (NADPH2)Pantothenic AcidAscorbic AcidVitamin B 12 DeficiencyMicronutrientsFolic Acid TransportersDietNutritional StatusRiboflavinNutritional RequirementsSymportersBreadTanzaniaAvitaminosisRisk FactorsCleft LipCleft PalatePlacebosbeta CaroteneFlourInfant, Newborn2,3-Diketogulonic AcidFolate Receptor 1ThiamineCongenital AbnormalitiesPregnancy ComplicationsPrenatal Nutritional Physiological PhenomenaFormyltetrahydrofolatesIronSpinal DysraphismUnited StatesAminopterinZincRiskTabletsQuestionnairesReduced Folate Carrier ProteinPterinsFIGLU TestProspective StudiesPyridoxineCerealsStomatitis, AphthousConfounding Factors (Epidemiology)Drug CombinationsVitamin DMethotrexateAnencephalyHomocystineMethylmalonic AcidPregnancy Complications, InfectiousDose-Response Relationship, DrugCase-Control StudiesPregnancy Outcome4-Aminobenzoic AcidCohort StudiesPregnancy Trimester, SecondBiological AvailabilityErythrocytesAntioxidantsPrenatal Exposure Delayed EffectsFollow-Up StudiesGlutamatesAnemia, MegaloblasticPremature BirthPregnancy Complications, HematologicMethionineEthnic GroupsOdds RatioLogistic ModelsVitamin B Deficiency