i am sure...no i know the IFBB pro's have used & tried everything going and they know exactly what works for them, it would be very hard to commet on exactly what individuals are taking, because that would have to come from themselves, but i do know dorian,nasser,sonbaty and dillett were lovers of the short shock cycling theory (which i love as some of you know). you have to try compounds for yourself and find what works and what is best for your body to respond with as little sides as possible, experience counts for everything and knowing your body