Iodine

http://www.whfoods.com/genpage.php?tname=nutrient&dbid=69

http://www.nlm.nih.gov/medlineplus/druginfo/natural/35.html

http://articles.mercola.com/sites/articles/archive/2013/05/04/iodine-deficiency-affect-childs-brain-function.aspx

http://www.webelements.com/iodine/

http://articles.mercola.com/sites/articles/archive/2013/06/29/iodine-deficiency-risk.aspx