Not “hardcore” like ‘roids – We have to accept that the male body will only be able to produce a limited amount of testosterone. As boosters are not steroids, they don’t actually inject the hormone into the body. Steroids for gaining muscle mass (anabolic steroids) are illegal in most countries and should only be used under the guidance of a trained medical professional, and only to treat serious medical or health related issues. Of course, steroids can work extremely well for testosterone , at the expense of some horrible side effects. The point is, even though they are effective, you shouldn’t expect T-boosters to share the extreme effects of anabolic steroids – so if that’s what you’re going after, look elsewhere. More on testosterone boosters vs. steroids
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.     
One thing that is often overlooked when it comes to testosterone boosters is the dosing. Test boosters aren’t like other supplements where you can just take the one dosing per day and forget about until the next day. As with any supplement, it only stays in your system for 4-8 hours. This means you need to be taking more than one dose per day. 2 doses are better but it still is not enough. If you want to keep your test levels up all day you will need to be taking at least 3 and preferably 4 doses per day to keep your testosterone levels high throughout the day and to keep them from dropping between doses. You should also be sure to take them every day and try to not miss any doses to get the most out of them.