Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males. 
I’m in Bangkok and surprised about how many people are having difficulty getting gear. I should start my own business just buying from these guys and selling to you!. If you’re coming here and want to know where you can get the stuff I’ll give you the details. He is very legit and I’ve seen some serious competition bodybuilders who buy from him. Also they sell a brand that is trustable in Thailand. It’s not what I do a for a living but I’d be glad to help as long as I’m not inundated with emails 🙂 I found at least 2 pharamcies that sell testorone which seems very common at pharamcies in certain areas.
DHEA is transformed into DHEA-S by sulfation at the C3β position via the sulfotransferase enzymes SULT2A1 and to a lesser extent SULT1E1 .    This occurs naturally in the adrenal cortex and during first-pass metabolism in the liver and intestines when exogenous DHEA is administered orally. [ citation needed ] Levels of DHEA-S in circulation are approximately 250 to 300 times those of DHEA.  DHEA-S in turn can be converted back into DHEA in peripheral tissues via steroid sulfatase (STS).