why on earth ANYONE would want to use clen is one i will never understand and constantly has me smfh... so, its smart to put that much strain on your heart, cause long and short term damage, have tremors, shakes, heart skipping beats etc... so you can lose a few pounds that your going to gain back after you discontinue use... all me crazy, but thats not making much sense to me.. you can stack whatever you want but should you? absolutely not... GW501516 and SR9009 will not only be more beneficial but have NO side effects whatsoever... thats up to you, and if your have a wish to hurt yourself, there's nothing better than clen... its definitely great at that...