Trenbolone is not a human product and instead was invented to be used on cattle, it falls under the category as a selective androgen receptor modulators. People started extracting this drug from pellets used in cattle implants. So I doubt you will ever see a placebo controlled study using it. I also express this same word of warning implying that there is a link from the use of testosterone to aggressive behavior when this link has yet to be established. So yes, if you are naturally an aggressive person, you will be an aggressive person using testosterone. My wife is a very aggressive woman, when she uses testosterone she is just as aggressive. Being aggressive is a trait that leads to good athletes. My wife was an IFBB pro. I have the same trait and was very competitive in quite a few different sports. Testosterone just help me build the muscle needed to compete at a high level. My aggressive behavior has never changed through my life only mellowed out with age and injuries.