Some people say they feel cyp by week 4.. I think it is more mental than actually feeling it! I start getting results from cyp in week 5-6 (START!!) usually after I start feeling it it kicks in harder and harder almost daily! Remember you are building on the long 1/2 life so give it time! I do not even strt looking for sides or gains until at leat wnd of week 4-5! only thing I notice before that is some sex drive and my sweat gets a weird smell