It's a weight loss drug they developed in the 30's. It's one of those things that a decent amount is good but too much will kill you. It will basically cook you from the inside out. It takes a few days to build in your system so people wind up taking too much thinking it isn't working then wind up frying themselves.

Honestly an effective dose makes you feel miserable. You basically sit on the couch sweating your ass off while drinking tons of water and green tea. But it is muscle sparing and my last run of it 4 years ago I lost 16 pounds in 11 days while doing absolutely nothing.

It's definitely a drug of last resort. I wouldn't recommend it to anyone that could take clen and jump some rope or something of that nature. If you have a leg injury or are hampered in some other way that prevents you from doing cardio it can be effective, but again, is very dangerous in the wrong hands.

If something got banned more than 50 years ago when they still let you smoke in hospitals and had cars with no seat belts you can imagine how bad it must be.