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Trigonella foenum-graecum, more commonly known as fenugreek, has been purported to inhibit aromatase and 5-α reductase. A clinical trial did in fact show that fenugreek did inhibit aromatase and 5-α reductase to a certain extent, and it increased endogenous testosterone levels. It also resulted in greater increase of fat loss, increase of fat free mass, and one-repetition-maximum values for the leg press than those who did not take fenugreek. Another clinical trial resulted in an increase in bench press one-repetition-maximum for those who were supplemented with fenugreek. Fenusterols is a fenugreek seed extract that contains 50% steroidal saponins.
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.