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Clenbuterol HCL is a strong beta-2 adrenergic agonist, kind of like salbutamol or epinephrine. It’s mainly a bronchodilator, but it also cranks up your metabolism and helps relax smooth muscle. The half-life is long—usually 36 to 48 hours, but sometimes up to 72. It works by boosting cAMP through beta-2 receptors, which means more fat burning and muscle relaxation. What People Use It For Some countries use it as a prescription bronchodilator for asthma or COPD. In fitness and bodybuilding, people take it for fat loss (it can bump up your basal metabolic rate by 10–15%), to help keep muscle during a cut, and to improve cardio endurance. It’s especially popular during contest prep or after a steroid cycle to help keep fat off.