Trenbolone is similar to the highly popular steroid Nandrolone, in that they are both 19-nor steroids, meaning that a testosterone molecule has been altered at the 19th position to give us a new compound. Unlike Nandrolone however Trenbolone is an excellent mass and hardening drug with the majority of gains being muscle fibre, with minimal water retention Trenbolone greatly increases the level of the extremely anabolic hormone IGF-1 within muscle tissue. And, its worth noting that not only does it increase the levels of IGF-1 in muscle over two fold, it also causes muscle satellite cells (cells that repair damaged muscle) to be more sensitive to IGF-1 and other growth factors. The amount of DNA per muscle cell may also be significantly increased. Trenbolone also has a very strong binding affinity to the androgen receptor (), binding much more strongly than testosterone. This is important, because the stronger a steroid binds to the androgen receptor the better that steroid works at activating dependent mechanisms of muscle growth. There is also strong supporting evidence that compounds which bind very tightly to the androgen receptor also aid in fat loss. Trenbolone Acetate has a release time of between 1-3 days. It is typically injected once a day, though some users opt for a higher injection frequency of once every other day. Average dosages are 35mg-150mg per day.