The best pro-hormone I have used is P6 Extreme (Cellucor). It has a combination of 6 diff. diol and it hits every aspect of testosterone. Plus it has 3 other ingredients, including tribulus, that raise the body's natural production of testosterone. Another thing it has is an ingredient (forgot the name) that blocks estrogen conversion. So when you get off, all of your testosterone remains as free roaming testosterone in the blood. I gained 30lbs. on my bench in 2 wks and put on 7 lbs. of lean muscle. I love this stuff and won't take anything else. They have a website www.cellucor.com if you have any questions.
~Steadyballin