Fist two are about testosterone and the last one is about growth hormone

http://www.youtube.com/watch?v=j4Sgd80K_Ec

http://www.youtube.com/watch?v=NeeZ8j1jLLk

http://www.youtube.com/watch?v=Q8Uzx...eature=related

I use videos a lot as the information seems to be easier to process over reading for me.