25-Hydroxyvitamin D3 1-alpha-HydroxylaseMilk SubstitutesCholesterol 7-alpha-Hydroxylase25-Hydroxyvitamin D 2CalcifediolVitamin DVitamin D DeficiencyCholecalciferolHydroxycholecalciferolsSteroid HydroxylasesDihydroxycholecalciferolsErgocalciferols24,25-Dihydroxyvitamin D 3Parathyroid HormoneCholestanetriol 26-MonooxygenaseCalcitriolVitamin D-Binding ProteinPhenylalanine HydroxylaseRicketsSunlightSteroid 21-HydroxylaseReceptors, CalcitriolSeasonsHydroxylationTryptophan HydroxylaseDietary SupplementsVitaminsTyrosine 3-MonooxygenaseCytochrome P-450 Enzyme SystemMixed Function OxygenasesPhosphorusProcollagen-Proline DioxygenaseCalciumCalcium, DietaryOsteomalaciaBone DensityChromatography, High Pressure LiquidCross-Sectional StudiesKidneyBone and BonesEnergy MetabolismLipid MetabolismNutritional StatusKineticsSkin PigmentationBiological MarkersRisk FactorsLinear ModelsProspective StudiesDietBone Density Conservation AgentsCase-Control StudiesLiverBenzopyrene HydroxylaseMolecular Sequence Dataalpha 1-AntitrypsinMass SpectrometryPhosphatesAdrenal Hyperplasia, CongenitalHypoxia-Inducible Factor 1, alpha SubunitBase SequenceTime Factors4-Hydroxybenzoate-3-MonooxygenaseEuropean Continental Ancestry GroupFood, FortifiedRNA, MessengerCholestenesDose-Response Relationship, DrugDehydrocholesterolsMicrosomes, LiverCohort StudiesTandem Mass SpectrometryRadioimmunoassayChromatography, LiquidPrevalenceHypoparathyroidismNutritional RequirementsIntestinal AbsorptionReceptors, Adrenergic, alphaNutrition SurveysSpectrophotometry, UltravioletCloning, MolecularAlkaline PhosphataseBody Mass IndexAfrican AmericansSubstrate SpecificityPregnancyRecombinant ProteinsAbsorptiometry, PhotonGene Expression Regulation, EnzymologicAdrenodoxinHypercalcemiaOsteoporosisAmino Acid SequenceBostonChickensNutrition PolicyProtein BindingDouble-Blind MethodPostmenopause