Actually higher level of testerone make you have more muscles, without doing a damned thing. 
The same thing was claimed for high protein diets, 
people who eat more meat, tend to have more musclemass,
the famous era back in the 90, 
eating 2 or more pound meat a day. 
There could be a certain truth in it, 
meat contains higher levels of animalAAS that supposed to be safe for humans.