http://www.raysahelian.com/5-hydroxytryptophan.html

http://www.ehow.com/how_5444904_hydroxytryptophan-side-effects.html

http://www.depression-guide.com/5htp.htm

http://www.drugs.com/mtm/5-hydroxytryptophan.html

http://www.cigna.com/healthinfo/d04726a1.html

http://www.referencefatburner.com/5-htp.html

http://www.vitamins-supplements.org/amino-acids/5-HTP.php

http://www.peacehealth.org/kbase/multum/d04726a1.htm

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

http://www.wholehealth.com/index.cfm?fuseaction=category.display&category_id=178