True he does list some of his own products, but I didn't view that as him advertising his stuff. I viewed it as someone who was passionate about their work and wanted to share and make their research available. This is a man who has seemed to have done his homework. Even if you don't do the cleanse that he recommends in the first book, this second book really just relates a lot of info about how digestion works, and what impedes it. I think anyone could learn a little something from reading it. All of his work is footnoted and documented. It's the type of book that you just kind of pick at. I don't think you would be dissapointed if you are looking to inspire your own personal health research.