Vitamin DVitamin D DeficiencyVitamin AVitaminsCholecalciferolVitamin EReceptors, CalcitriolVitamin B 12Vitamin A DeficiencyCalcitriolCalcifediolErgocalciferolsDietary SupplementsVitamin D-Binding ProteinVitamin K 1SunlightVitamin B 6RicketsVitamin E DeficiencyVitamin B 12 Deficiency25-Hydroxyvitamin D3 1-alpha-HydroxylaseHydroxycholecalciferolsVitamin K DeficiencyParathyroid Hormone25-Hydroxyvitamin D 2Vitamin B 6 DeficiencyVitamin D Response ElementDihydroxycholecalciferolsAscorbic AcidCalcium, Dietary24,25-Dihydroxyvitamin D 3Cholestanetriol 26-MonooxygenaseCalciumDietPyridoxineSteroid HydroxylasesVitamin K 2OsteomalaciaBone Density Conservation AgentsNutritional StatusBone and BonesPhosphorusSeasonsBone DensityAvitaminosisNutritional RequirementsVitamin B DeficiencyFood, FortifiedHypocalcemiaAntioxidantsVitamin K 3Hyperparathyroidism, SecondaryFolic AcidNutrition PolicyHypercalcemiaOsteoporosisRisk FactorsMolecular Sequence DataVitamin K Deficiency BleedingDose-Response Relationship, Drugalpha-TocopherolSkin Pigmentationbeta CaroteneIntestinal AbsorptionDouble-Blind MethodOsteocalcinAmino Acid SequenceKineticsEnzyme ActivationBiological MarkersTime FactorsPregnancyCells, CulturedSignal TransductionLiverCross-Sectional StudiesPhosphatesCase-Control StudiesMineralsSodium-Coupled Vitamin C TransportersRNA, MessengerAlkaline PhosphataseRetinoid X ReceptorsPrevalenceParathyroid GlandsPyridoxal PhosphateTocopherolsCell LineVitamin K Epoxide ReductasesAdministration, OralHypophosphatemia, FamilialChromatography, High Pressure LiquidHomocysteineBase SequenceTranscobalaminsProspective StudiesFractures, BoneDihydrotachysterolRecombinant ProteinsGene Expression Regulation