I took xenadrine and it helped me lose mad weight, but it doesn't do much without diet and excercise, it helps control your appetite which was the biggest plus for me, cause i used to be a snack addict... definately cycle it, take at least a weeks break between bottles. if you want good prices i buy all my stuff at www.justmuscle.com. alot better than GNC. Yellow jackets and hydroxy cut are ok, but cytodyne uses better quality herbs so their more consistent.but most important stick to a routine that works for you, and stay with it... that's my two cents.