it accelerates fat loss. more thyroid floating around, more burnt fat. BUT also burns muscle, hence using an anabolic compound like test with it to compensate for the catabolic nature of it. this is pyramiding it from 12.5-100mcg slowly, then back down, for about 6-8 weeks. also it can be used in 25mcg or so for increased protein synthesis w/o much worry about burning muscle for extended periods of time. will burn some fat too used in that manner.