My guess would be cause its not like any heavy water bloat AAS like dbol,anadrol, test, etc. I hope I'm saying this right in that its Highly anabolic but mildly androgenic. In lay terms it produces real but slow muscle growth as oppossed to the others which pump up your muscles with water. After a cycle even with a post-cycle recovery agents some of that water based muscle will be lost, this is why you should never do a anadrol or dbol only cycle. Thats also why anytime you do a test or dbol or deca its always wise to add a anavar, EQ, primo, winny.