I am using it now...I used the dermacrine first....4-5 pumps a day before i went to bed...Now that i finished that, i am using the sustain for part of my post cycle..since off cycle i never crashed, still stoked for the gym everyday, sex drive is still high..so great stuff...i am about to buy more dermacrine and some of that phyto test..or however you spell it, to take until i can get back on and have recovered fully...haha