Vitamin DVitamin D DeficiencyAbsorptionIntestinal AbsorptionVitamin AVitaminsCholecalciferolVitamin EVitamin B 12Receptors, CalcitriolVitamin A DeficiencyCalcifediolCalcitriolErgocalciferolsDietary SupplementsVitamin D-Binding ProteinVitamin K 1SunlightRicketsVitamin B 6Vitamin E DeficiencyVitamin B 12 DeficiencyHydroxycholecalciferols25-Hydroxyvitamin D3 1-alpha-HydroxylaseCalcium, DietaryVitamin K DeficiencyParathyroid Hormone25-Hydroxyvitamin D 2Ascorbic AcidVitamin B 6 DeficiencyVitamin D Response ElementDihydroxycholecalciferolsDietBiological Availability24,25-Dihydroxyvitamin D 3CalciumSkin AbsorptionCholestanetriol 26-MonooxygenaseNutritional StatusPhosphorusOsteomalaciaFood, FortifiedVitamin K 2PyridoxineBone and BonesSteroid HydroxylasesBone Density Conservation AgentsAdministration, OralJejunumSpectrophotometry, AtomicBone DensityNutritional RequirementsSeasonsX-Ray Absorption SpectroscopyAvitaminosisIronIntestine, SmallVitamin B DeficiencyFolic AcidHypocalcemiaSpectrophotometryAntioxidantsDuodenumIntestinesHyperparathyroidism, SecondaryMalabsorption SyndromesDose-Response Relationship, DrugZincVitamin K 3Mineralsbeta CaroteneNutrition PolicyHypercalcemiaOsteoporosisSpectrum AnalysisDouble-Blind MethodRisk Factorsalpha-TocopherolTime FactorsVitamin K Deficiency BleedingChromatography, High Pressure LiquidLiverSkin PigmentationCalcium CarbonateCarotenoidsPhosphatesPhytic AcidCaco-2 CellsOsteocalcinIntestinal MucosaSpectrophotometry, UltravioletKineticsMilkZinc RadioisotopesBiological MarkersPregnancyTranscobalaminsFecesBiological TransportTocopherols