Clenbuterol is a widely used bronchodilator in many parts of the world. In animal studies, clenbuterol is shown to exhibit anabolic activity, so it is obviously an attractive trait to the athlete. This compound is additionally a known thermogenic, with beta-2 agonists like clenbuterol shown to directly stimulate fat cells and accelerate the breakdown of triglycerides to form free fatty acids. Its efficacy makes it an attractive pre-contest drug.