I want to do the best I can to provide you with the most accurate information possible. I have included some of my own findings here, which I feel are the most valid, and most scientifically sound, so please use them at your own risk. However, this is only one side of the story, and there are many other factors in play besides the testosterone. There is no single answer to everything that could affect your testosterone levels. There are many factors that influence what a hormone does.
For more information, see my testosterone article on this website (http://www.virginiaonline.com/virginia/health/testosterone/articles/treat/Treat-T...), and also my testosterone section on this website (http://www.virginiaonline.com/virginia/health/testosterone/testosterone-...). I also have a page with a detailed list of all the testosterone supplements, and a list of the testosterone hormones that will work with which testosterone supplements. There is also a detailed testosterone section on the bottom of this page.
The first testosterone supplement that is often recommended is called Testo-Lunar. Testo-Lunar has been studied extensively. It works well. It's been shown to be effective in reducing the chances of developing testicular cancer (also called "testis cancer"). It also has a lot of benefits for men who want to avoid taking too much estrogen. I use Testo-Lunar for my testicular cancer patients, and I think it's great for them.