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What is Clenbuterol?Clenbuterol, commonly known as 'clen', is a drug that was originally created as a bronchodilator to treat asthma and other respiratory diseases in horses. However, due to its potent fat-burning and muscle-preserving qualities, it has gained immense popularity among athletes and bodybuilders around the world. This drug is a beta-2 agonist which is similar to ephedrine and amphetamines. It is cleared by the FDA to treat severe asthma in humans in some countries but not ..