Folic AcidVitamin B 12HomocysteineFolic Acid DeficiencyNeural Tube DefectsTetrahydrofolatesDietary SupplementsFood, FortifiedVitamin B ComplexFolic Acid AntagonistsPreconception CareUric AcidFolate Receptors, GPI-AnchoredHyperhomocysteinemiaAnemia, MacrocyticHematinicsVitamin B 6Vitamin B 12 DeficiencyPteroylpolyglutamic AcidsPregnancyFolic Acid TransportersHyperuricemiaBreadVitaminsPrenatal CareFlourFolate Receptor 1Methylenetetrahydrofolate Reductase (NADPH2)Double-Blind MethodPrenatal Nutritional Physiological PhenomenaFormyltetrahydrofolatesDietSpinal DysraphismAminopterinMethylmalonic AcidReduced Folate Carrier ProteinPterinsNutritional RequirementsFIGLU TestPyridoxineCereals