Vitamin B 12 DeficiencyVitamin B 6Dietary SupplementsVitamin AVitaminsVitamin DVitamin EVitamin B 12Vitamin B ComplexVitamin A DeficiencyPyridoxineVitamin D DeficiencyFolic AcidTranscobalaminsVitamin B DeficiencyCobalt IsotopesVitamin K 1Vitamin E DeficiencyAscorbic AcidVitamin K DeficiencyVitamin B 6 DeficiencyCholecalciferolPyridoxal PhosphateDietFood, FortifiedFolic Acid DeficiencyRiboflavinMethylmalonic AcidAnemia, PerniciousThiamineIntrinsic FactorMineralsAvitaminosisNutritional StatusNutritional RequirementsPyridoxic AcidAnemia, MegaloblasticHydroxocobalaminReceptors, CalcitriolVitamin D-Binding ProteinAnemia, MacrocyticPyridoxalMicronutrientsHyperhomocysteinemiaAntioxidantsMalabsorption SyndromesPyridoxal KinaseVitamin K 2Calcifediolbeta CaroteneSchilling TestCobamidesAnimal FeedCalcitriolErgocalciferolsCalcium, DietaryDouble-Blind MethodCobalt RadioisotopesPregnancyNutrition Policyalpha-TocopherolEuglenaPyridoxamineIntestinal AbsorptionVitamin K 3SunlightTrace ElementsPantothenic AcidMethylenetetrahydrofolate Reductase (NADPH2)RicketsBhutanRandom AllocationDietary ProteinsMethionineDiet, VegetarianCorrinoidsVitamin K Deficiency BleedingHomocysteineAdministration, OralRisk FactorsPlant PreparationsCarotenoidsBiological AvailabilityLiverBody Weight5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseCystathionineSeleniumTocopherolsXanthurenatesNutritional Physiological PhenomenaNeural Tube DefectsPyridoxaminephosphate OxidasePostgastrectomy SyndromesAnimal Nutritional Physiological PhenomenaDose-Response Relationship, DrugMethylmalonyl-CoA MutaseHydroxycholecalciferolsHypervitaminosis AZinc