Folic AcidDietary SupplementsFolic Acid DeficiencyVitamin B ComplexPreconception CareNeural Tube DefectsMaternal Nutritional Physiological PhenomenaHomocysteineMethylenetetrahydrofolate Reductase (NADPH2)TetrahydrofolatesPregnancyHyperhomocysteinemiaDietFolate Receptors, GPI-AnchoredDNA MethylationReduced Folate Carrier ProteinFolate Receptor 1Risk FactorsInfant, NewbornVitamin B 12Food, FortifiedProton-Coupled Folate TransporterVitaminsDouble-Blind MethodPteroylpolyglutamic AcidsAnimal FeedVitamin ANutritional StatusVitamin EZincMicronutrientsFolate Receptor 2Vitamin B 6Folic Acid AntagonistsRandom AllocationVitamin B 12 DeficiencyAnimal Nutritional Physiological Phenomenagamma-Glutamyl HydrolasePlacebosAntioxidantsbeta CaroteneAscorbic AcidNutritional RequirementsIronSeleniumalpha-TocopherolAnemia, Iron-DeficiencyFish OilsFatty Acids, Omega-3CholecalciferolMethionineDocosahexaenoic AcidsPrenatal Nutritional Physiological PhenomenaDigestionErythrocytesAdministration, OralBody WeightTrace ElementsVitamin DDietary Proteins5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseVitamin A DeficiencyIron, DietaryFormyltetrahydrofolatesRiboflavin4-Aminobenzoic AcidWeight GainMethotrexateRumenCalcium, DietaryMethylmalonic AcidOxidoreductases Acting on CH-NH Group DonorsLactationCreatineAnemia, MacrocyticLiverPyridoxineDose-Response Relationship, DrugFolic Acid TransportersCattleLactobacillus caseiEatingNutrition PolicyMilk, HumanVitamin D DeficiencyFIGLU TestTime FactorsHemoglobinsSwineEicosapentaenoic AcidCross-Over StudiesBiological Availability