http://en.wikipedia.org/wiki/5-hydroxytryptophan

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http://www.mothernature.com/Library/Ency/Index.cfm/Id/2793000

http://health.yahoo.com/nutrition-supplements/5-hydroxytryptophan/healthwise--d04726a1.html

http://www.livestrong.com/article/22668-5hydroxytryptophan/

http://www.umm.edu/altmed/articles/5-hydroxytryptophan-000283.htm

http://www.peacehealth.org/kbase/cam/hn-2793000.htm

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http://www.webvitamins.com/product.aspx?id=14709

http://www.publix.com/wellness/notes/Display.do?id=Benefits_Weight&childId=5-HTP