Vitamin DVitamin D DeficiencyVitamin AVitaminsVitamin EVitamin B 12Intestinal AbsorptionAbsorptionVitamin A DeficiencyCholecalciferolReceptors, CalcitriolVitamin K 1Vitamin B 6Vitamin E DeficiencyVitamin B 12 DeficiencyCalcifediolCalcitriolDietary SupplementsErgocalciferolsVitamin D-Binding ProteinVitamin K DeficiencyVitamin B 6 DeficiencyAscorbic AcidSunlightRicketsHydroxycholecalciferols25-Hydroxyvitamin D3 1-alpha-HydroxylaseCalcium, DietaryParathyroid Hormone25-Hydroxyvitamin D 2DietVitamin D Response ElementPyridoxineVitamin K 2Dihydroxycholecalciferols24,25-Dihydroxyvitamin D 3Nutritional StatusBiological AvailabilityCalciumVitamin B DeficiencyFood, FortifiedAvitaminosisCholestanetriol 26-MonooxygenaseAntioxidantsFolic AcidVitamin K 3Nutritional RequirementsOsteomalaciaPhosphorusBone and Bonesbeta CaroteneVitamin K Deficiency Bleedingalpha-TocopherolBone Density Conservation AgentsAdministration, OralSkin AbsorptionBone DensitySeasonsJejunumMineralsCarotenoidsSodium-Coupled Vitamin C TransportersTranscobalaminsNutrition PolicyDose-Response Relationship, DrugSteroid HydroxylasesTocopherolsHypocalcemiaDouble-Blind MethodSpectrophotometry, AtomicIronVitamin K Epoxide ReductasesHomocysteineLiverRisk FactorsMalabsorption SyndromesIntestine, SmallHyperparathyroidism, SecondaryOsteoporosisZincHypercalcemiaX-Ray Absorption SpectroscopyChromatography, High Pressure LiquidRiboflavinTime FactorsIntestinesDuodenumMethylmalonic AcidOsteocalcinPyridoxal PhosphateCobalt IsotopesSpectrophotometryPregnancyCarbon-Carbon LigasesSkin PigmentationBiological MarkersPhosphatesMicronutrientsHypervitaminosis AMilk