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References

Daily Vitamin A Requirement

  1. Tilman Grune, Georg Lietz, Andreu Palou, A. Catharine Ross, Wilhelm Stahl, Guangweng Tang, David Thurnham, Shi-an Yin, Hans K. Biesalski: β-Carotene Is an Important Vitamin A Source for Humans; J Nutr. 2010 Dec; 140(12): 2268S–2285S.; Published online 2010 Oct 27.; doi: 10.3945/jn.109.119024; PMCID: PMC3139236
  2. Vitamin A and Carotenoids Fact Sheet for Health Professionals
  3. Colorado State University Extension, L. Bellows and R. Moore: Fat-Soluble Vitamins: A, D, E, and K – 9,315; accessed on July 11, 2016
  4. Institute of Medicine (US) Panel on Micronutrients. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington (DC): National Academies Press (US); 2001. 4, Vitamin A.