Folic AcidFolic Acid DeficiencyNeural Tube DefectsTetrahydrofolatesHomocysteineFood, FortifiedDietary SupplementsVitamin B 12Vitamin B ComplexFolic Acid AntagonistsPreconception CareFolate Receptors, GPI-AnchoredHyperhomocysteinemiaAnemia, MacrocyticHematinicsVitamin B 6Pteroylpolyglutamic AcidsVitamin B 12 DeficiencyFolic Acid TransportersPregnancyBreadVitaminsPrenatal CareFlourFolate Receptor 1Methylenetetrahydrofolate Reductase (NADPH2)Prenatal Nutritional Physiological PhenomenaFormyltetrahydrofolatesSpinal DysraphismAminopterinDouble-Blind MethodReduced Folate Carrier ProteinPterinsFIGLU TestPyridoxineCerealsMicronutrientsDietMethotrexateAnencephalyNutritional RequirementsHomocystineMethylmalonic AcidNutrition Policy4-Aminobenzoic AcidRiboflavinBiological AvailabilityErythrocytesNutritional StatusGlutamatesMaternal Nutritional Physiological PhenomenaCleft PalateAnemia, MegaloblasticPregnancy Complications, HematologicMethionineVitamin B DeficiencyPlacebosIronAnemia, Iron-DeficiencyOxidoreductases Acting on CH-NH Group DonorsAnemia, Perniciousgamma-Glutamyl HydrolaseIron, DietaryCleft LipPregnancy ComplicationsAdministration, OralInfant, NewbornKB CellsIrelandIntestinal AbsorptionTrimetrexateTetrahydrofolate DehydrogenaseDose-Response Relationship, DrugLactobacillus caseiNepalMethylenetetrahydrofolate Dehydrogenase (NAD+)LeucovorinBetaineCongenital AbnormalitiesMouth Abnormalities