Well, the body creates higher amounts of natural testosterone due to the negative feedback from the estrogen levels via 6-OXO.
There are a few questions though in regards to this:
1. Does the levels create an anabolic effect ?
2. How much of an anabolic effect does it create (assuming it does) ?
I could probably ask Patrick about this, but these are some things to keep in mind. The typical person would assume 'increase testosterone=better' however there is more to the story than just this. In the 6-OXO studies, I dont know if muscle mass gained was even measured, I could be wrong. The only thing that was tested was the testosterone levels of the individuals.
If you want to put on muscle, you are better off using a synthetic analog instead of trying to increase your natural test enough to 'pack on muscle.'