RiboflavinRiboflavin SynthaseAbsorptionIntestinal AbsorptionFlavin MononucleotideFlavinsGlutathione ReductaseFlavin-Adenine DinucleotideVitamin B ComplexBiological AvailabilityBulbar Palsy, ProgressiveSkin AbsorptionNutritional RequirementsThiamineJejunumSpectrophotometry, AtomicSpectrophotometryIronX-Ray Absorption SpectroscopyPhotosensitizing AgentsPteridinesDietUltraviolet TherapyIntestine, SmallSpectrum AnalysisVitaminsEgg WhitePyridoxineKineticsMembrane Transport ProteinsZincBiological TransportHydrogen-Ion ConcentrationIron, DietaryAdministration, OralFolic AcidIntestinesSpectrophotometry, UltravioletZinc RadioisotopesPyridoxaminephosphate OxidasePhytic AcidDuodenum