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The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression". [79] [80] 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. [79] 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. [81] Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males. [82] [83] [84] [85] [86]

Just take this pre-workout about 30 minutes before the gym. Once this amino acid rich formula hits your blood stream, it will begin taking effect. It starts by increasing the available precursors for the powerful molecule, Nitric Oxide. Once NO permeates your vascular tissue, it expands it, increasing the volume of blood flow. This optimizes your performance and maximizes your results. This Nitric Oxide Formula is safe and all natural. It can help naturally increase your nitric oxide levels, testosterone levels, libido and sexual performance. If you would like to learn about the 18 Day Nitric Surge Free Trial, continue reading.

Free testosterone trial

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