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What Does Vitamin A Do? Understanding the Benefits of Vitamin A for the Body

“Listing of Vitamins” Harvard Health Publications, Harvard Medical School. Jun. 2009. Web. 27 Mar. 2017. 
Bradford, Alina. “Vitamin A: Sources & Benefits,” Live Science. 25 Aug. 2015. Web. 04 Apr. 2017. 
Szalay, Jessie.“What Are Carotenoids?” Live Science. 15 Oct. 2015. Web. 04 Apr. 2017.
Sources of Vitamin A: Isotonix® Dietary Supplement