Clenbuterol has been one of the latest crazes in weight loss.  And frankly, many have heard that celebrities are using it, so it must be effective.  I would say that celebrities are using it, so it must be extreme and frankly quite hard to use or dangerous.  So either way slow down and learn about this particular substances.  Clenbuterol legally speaking is only used in horses to treat asthma.  It was banned by the FDA in 1991 for human use, because while it does show extra fat burning and muscle building tendencies in animals, there were cases in humans of serious side effects when they consumed the meats from those extremely large animals, let alone when they took it themselves.  Again, it has only been used in large farm animals legally speaking even before 1991.  In 1998, they then approved it to be used in horses suffering from lung obstruction.  But that horse could not actually be used for food at that time, nor could any other animal taking it, not that I would understand why you would want to eat horse anyway.  That being said, you can surf the web and find multiple sites talking about clenbuterol.  But this is not like ephedra where the results may be overturned and otherwise allowed to give you small amounts.  Clenbuterol is dangerous for everyone in every case, and it should never be used.