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Life SciencesBiochemistryNutritional SciencesFood ChemistryHuman NutritionMicronutrient NutritionVitamin BiochemistryVitamin ChemistryVitamin PhysiologyVitamin SupplementationVitamins In FoodsWater-soluble VitaminsCarotenoid ChemistryCarotenoid MetabolismVitamin A InteractionsVitamin A Physiology