I have been researching 5-HTP for some time, and using the web as a vital resource. When evaluating books on the subject, this one came highly rated by an online review by Steven Wm. Fowkes, Sr. Director of the Cognitive Enhancement Research Institute (CERI):http://www.ceri.com/rev-sero.htmI recommend anyone considering reading a book on 5-HTP to examine this review first. I would publish it here, but for the copyright considerations. Cheers!