Vitamin B 12 DeficiencyVitamin B 6Vitamin AVitaminsVitamin DVitamin EVitamin B 12Vitamin B ComplexVitamin A DeficiencyPyridoxineVitamin D DeficiencyTranscobalaminsVitamin B DeficiencyFolic AcidCobalt IsotopesVitamin K 1Vitamin E DeficiencyDietary SupplementsVitamin K DeficiencyAscorbic AcidVitamin B 6 DeficiencyPyridoxal PhosphateCholecalciferolAnemia, PerniciousFolic Acid DeficiencyMethylmalonic AcidThiamineRiboflavinIntrinsic FactorPyridoxic AcidAnemia, MegaloblasticHydroxocobalaminReceptors, CalcitriolVitamin D-Binding ProteinAnemia, MacrocyticPyridoxalAvitaminosisHyperhomocysteinemiaPyridoxal KinaseMalabsorption SyndromesDietVitamin K 2Schilling TestCobamidesCalcifediolNutritional StatusCalcitriolNutritional RequirementsCobalt RadioisotopesAntioxidantsErgocalciferolsEuglenaPyridoxamineVitamin K 3BhutanPantothenic AcidCorrinoidsVitamin K Deficiency Bleedingbeta CaroteneMethylenetetrahydrofolate Reductase (NADPH2)Food, FortifiedRicketsSunlight5-Methyltetrahydrofolate-Homocysteine S-Methyltransferasealpha-TocopherolDiet, VegetarianXanthurenatesMicronutrientsPyridoxaminephosphate OxidaseMethioninePostgastrectomy SyndromesIntestinal AbsorptionMethylmalonyl-CoA MutaseCystathioninePropionibacteriumSodium-Coupled Vitamin C Transporters25-Hydroxyvitamin D3 1-alpha-HydroxylaseLiverVitamin K Epoxide ReductasesHydroxycholecalciferolsNitrogenous Group TransferasesHomocysteineTocopherolsRisk FactorsDouble-Blind MethodPregnancyTetrahydrofolates25-Hydroxyvitamin D 2Biological AssayParathyroid HormoneCalcium, DietaryOld Age AssistanceNutrition PolicyVitamin D Response ElementSubacute Combined DegenerationMineralsAdministration, OralCase-Control StudiesCarbon-Carbon LigasesDihydroxycholecalciferols