Clen is supposed to burn fat. Many bodybuilders use it in a ripping/cutting cycle or for competitions. Be careful because it elevates your heart rate and makes your body get VERY warm especially if you take too much. I've got a naturally high metabolism. I've only used winstol v, deca, and sustanon (primarily, among others for different uses). But that was back in my college years. Things change fast and maybe people don't even like these anymore.