For the purpose of understanding and profiling phenylpropionate we will discuss its characteristics as an individual API. Phenylpropionate on its own usually gets administered twice a week or every third day. It has the usual side effects as all other testosterones. It has a high level of aromatization into estrogen and converts to DHT (dihydrotestosterone) as well. Conversion to estrogen creates as per usual gynecomastia and water retention. Water retention and an increase in blood pressure are also expected. Natural HPTA axis shuts down as soon as it gets administered and natural production of testosterone stops. The severity of the side effects is usually dose related and the higher the dose the more the side effects.
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.     
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