tren is one of the most powerful steroids commonly used in BB. i also feel that it is one of the most abused. i hear of people with little expereince with AAS, that are running stupid doses of tren. i believe many do this to try to compensate for poor diet and training. any steroid can be used for bulking or cutting. some are better suited for each goal than others. because tren is so powerful, i've seen gains when i used it in the off season, but personally, i'd prefer EQ or deca to grow, along with dbol or drol. imo, tren really shines as a great cutting drug and i do feel it adds to fat loss with the right diet. it doesnt take much tren to evoke a solid response. i suggest using the least amount that will get good results. the side effects can be awful for many people, so the less you take, the less you have to worry about the sides. for someone who has never used tren, ace is the best ester to start with. it is very fast acting and if one has issues, they can reduce the dose or come off and feel better within a day or 2. with the long esters, it can take 2 wks for sides to subside. the main issue i get is sleeplessness, but the list of potential issues is much bigger though. i find that longer acting tren tends to effect my BP more than ace. all steroids can effect the rest of your hormones. i dont personally know much about tren effecting them differently than most, but i wouldnt be surprised. i have personally suffered suppressed thyroid production while on tren and i've since read for myself that this can happen. after a couple months off, it returned to normal.