For all the new guys this book was recommended by kel here in forums. If you want to know and understand get it and study it. I understood some but there is so much info on this site sometimes it's hard to take it all in. I started the book and it makes things so easy to understand. It's worth the few bucks. My TRT is important so I wanted to know why and how, I think I have a better understanding now. Thanks KEL.