its just like anything else you use... its up to YOU how effective it is... gw happens to be so strong, that even with inactivity, it can work to an extent but when paired with the proper diet and training, its simply amazing... its the ultimate performance enhancer... it literally will enhance the performance enhancer.... it is that good if you get it in its pure form... the ONLY place i have EVER seen sell it in pure form is sarms1... they are the best of the best and they have their own version called CARDARINE which is the pure form...