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.     
Despite early success, Test X180 Ignite hasn’t been perfect. Because the product’s key ingredient is a very rare fenugreek seed extract known as Testofen, being able to keep up with the demand has been a challenge. “It’s a good problem to have, but one we struggle with everyday,” said the CMO. “Reality is, the supply is limited and keeping up with our customers isn’t easy. As we continue to work out the kinks in our supply chain, the best advice I can offer at the moment is if you see it, buy it, before you miss your opportunity. I think you’ll be impressed by the results.”
Maybe. If you’re a man, that is, suffering from true hypogonadism (insufficient testosterone production) as a result of genetics, injury, or infection. USADA constantly shoos away male TUE applicants who claim testosterone deficiencies but who are at best borderline “low” in testosterone. That perhaps earns them a prescription for voguish, supplemental “T” from their doctors, but not a hall pass to enter races. As VeloNews recently reported, USADA has even granted a special Recreational Competitor Therapeutic Use Exemption (RCTUE) for supplemental testosterone to a couple of aging male athletes. The unusual TUE is in effect so long as those guys don’t win.