Tweeti think some react better than others but i dont think there is a person who wont react at all. lots of guys say "heck im not growing on cycle" but its either they arent doing enough gear, the gear is fake, they arent eating enough, they arent training right or a combination of all or some of them. and dont forget the folks that think gear is a miricle muscle builder, you still have to work your ass off to grow.