AbsorptionIntestinal AbsorptionBlood-Brain BarrierSkin AbsorptionBiological AvailabilitySpectrophotometry, AtomicJejunumX-Ray Absorption SpectroscopyPermeabilityBlood-Retinal BarrierSpectrophotometryBlood-Air BarrierIronIntestine, SmallSpectrum AnalysisIntestinal MucosaCaco-2 CellsCommunication BarriersTight JunctionsBlood-Testis BarrierIntestinesAdministration, OralZinc RadioisotopesZincPhytic AcidBiological TransportIron RadioisotopesIleumZinc IsotopesWaterSpectrophotometry, UltravioletDuodenumFecesKineticsMalabsorption SyndromesSitosterolsEnterocytesCell Membrane PermeabilityLymphTime FactorsCapillary PermeabilityHydrogen-Ion ConcentrationDietIron, DietaryOccludinSodiumFerrous CompoundsCalcium, DietaryBlood-Aqueous BarrierRats, Sprague-DawleyCopperMannitolElectric ImpedanceModels, BiologicalSpectrophotometry, InfraredCholesterolPhytosterolsAzetidinesTissue DistributionColonCalciumPerfusionBile Acids and SaltsBlood-Nerve BarrierArea Under CurveChromatography, High Pressure LiquidChloridesLightBicarbonatesCross-Over StudiesLymphatic SystemDose-Response Relationship, DrugZonula Occludens-1 ProteinSolubilityBiological Transport, ActiveInjections, IntravenousFerritinsBileSpectrometry, FluorescenceRats, WistarRabbitsEpidermisHalf-LifeHealth Services AccessibilityLiverFood, FortifiedSpectrometry, X-Ray EmissionX-RaysCattleOxidation-ReductionGastrointestinal TransitSwinePhotochemistryDiffusionMicrovilliMembrane ProteinsIsotopesPharmacokineticsXyloseEpithelium