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

http://www.vanderbilt.edu/AnS/psychology/health_psychology/5htp_myth.htm

http://www.5-htp.org/

http://www.5-htp.net/

http://depression.about.com/cs/altmed5htp/f/5htp.htm

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

http://www.modern-psychiatry.com/5-htp.htm

http://www.5-htp.net/Safety.asp

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

http://www.naturalhealthconsult.com/Monographs/5-htp.html