This book is very dated. When published in 1998 there was very little known about DHEA. The author admits this. He admits that there is little experimental evidence to justify his conclusions. He may have a master's degree in biochemistry, but many of his conclusions are based on pseudoscience. In other words, my conclusions must be correct because men are basically animals and animals living in the wild act so and so. Blah, blah blah.After you get past the fact that the title is misleading, and much of the book is useless, there is some real scientific explanations of what DHEA is and why we need it. This could have all been boiled down to a few pages. But then he couldn't sell an $8 book.Don't waste your money.