The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
Every ingredient has been tried and tested under an array of real world physical stresses and environments from the weight room to the athletic field. Kris Gethin has tested and analyzed every supplement under multiple conditions, strategic dosages, and many combinations. He put his body through the extreme edges of endurance while preparing for a triathlon over a four-month period. Once completed, he again broke physical boundaries by pushing his body through the intense environment of a 12-Week Muscle-Building Plan that was documented daily by . The results of both were astounding.
It’s all common sense now, certainly I was not going to put myself and my body through the risks of anabolics. I can tell you though, shifting my mind from anabolic steroids simply was not an option for me. However, dealing with it’s side effects is what really held me back from getting any place near this stuff. With my friends’ help in telling about legal steroids, I no longer need to even touch a drop of anabolic steroids. First, I was certainly not going to put my health at risk. Second, I did not want to spend a few years in jail if I ever get busted with this stuff.