Vitamin B 12 DeficiencyVitamin B 6AbsorptionIntestinal AbsorptionVitamin AVitaminsVitamin DVitamin EVitamin B 12Vitamin B ComplexVitamin A DeficiencyPyridoxineVitamin D DeficiencyTranscobalaminsVitamin B DeficiencyFolic AcidCobalt IsotopesVitamin K 1Vitamin E DeficiencyAscorbic AcidDietary SupplementsVitamin K DeficiencyCholecalciferolVitamin B 6 DeficiencyAnemia, PerniciousPyridoxal PhosphateIntrinsic FactorFolic Acid DeficiencyRiboflavinThiamineMalabsorption SyndromesMethylmalonic AcidBiological AvailabilityDietAnemia, MegaloblasticPyridoxic AcidHydroxocobalaminReceptors, CalcitriolAnemia, MacrocyticPyridoxalSkin AbsorptionVitamin D-Binding ProteinAvitaminosisHyperhomocysteinemiaSchilling TestPyridoxal KinaseNutritional StatusJejunumVitamin K 2CalcitriolCalcifediolAdministration, OralCobamidesSpectrophotometry, AtomicIronNutritional RequirementsX-Ray Absorption SpectroscopyFood, FortifiedCobalt RadioisotopesAntioxidantsSpectrophotometryCalcium, DietaryIntestine, SmallErgocalciferolsEuglenaPyridoxamineZincbeta CaroteneLiverSpectrum AnalysisRicketsVitamin K 3BhutanPantothenic AcidIntestinesPostgastrectomy SyndromesCorrinoidsDuodenumVitamin K Deficiency BleedingSunlightBiological TransportDiet, Vegetarianalpha-TocopherolChromatography, High Pressure LiquidTime FactorsMethylenetetrahydrofolate Reductase (NADPH2)MethionineMineralsCarotenoidsKineticsMicronutrientsCalciumDose-Response Relationship, DrugHydroxycholecalciferolsFecesSpectrophotometry, UltravioletIleum5-Methyltetrahydrofolate-Homocysteine S-MethyltransferasePhytic AcidZinc Radioisotopes