Sources

 

http://www.orst.edu/instruct/ans311/311cl18.htm#vitA

http://www.cc.nih.gov/ccc/supplements/vita.html#what

http://www.howstuffworks.com/question129.htm

http://nutrition.about.com/library/blvita.htm?iam=howstuffworks_SKD&terms=retinol

http://www.sciencedaily.com/release\1998\08\98084064805.htm

http://www.sciencedaily.com/release\1999\03\990331063314.htm

http://class.fst.ohio-state.edu

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