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http://www.anyvitamins.com/vitamin-b2-riboflavin-info.htm
http://www.healthandage.com/html/res/com/ConsSupplements/VitaminB2Riboflavincs.html
http://www.mycustompak.com/healthNotes/Supp/Vitamin_B2.htm
http://www.chem.ox.ac.uk/mom/Vitamins/vitaminB2.html
http://books.nap.edu/books/030903728X/html/53.html#pagetop
http://home.caregroup.org/clinical/altmed/interactions/Nutrients/Vitamin_B2.htm
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