I am struggling with this problem.

Dr. Oz had a segment of his program today on this. He presented a doctor who has written a book about it.

I've assembled several links to Oz programs on this subject (not in any particular order):

The book is by Dr. Harry Fisch.

http://www.oregonlive.com/health/index.ssf/2013/11/drs_oz_and_roizen_testosterone.html

http://www.doctoroz.com/videos/truth-about-testosterone

https://www.youtube.com/watch?v=YHbPenAWnRo