Clenbuterol

Clenbuterol is a powerful sympathomimetic amine that functions as a beta-2 adrenergic agonist, originally developed as a bronchodilator for treating asthma. In the fitness and bodybuilding community, it is widely used as a thermogenic fat burner due to its ability to increase metabolic rate, promote lipolysis (fat loss), and preserve lean muscle during a calorie deficit.
Although not technically a steroid, Clenbuterol is often included in cutting stacks or contest prep cycles for its potent stimulant effects and ability to enhance physique definition.