Clenbuterol, commonly called Clen, is neither a steroid not a hormone but it is a very popular supplement among athletes and bodybuilders alike.
Athletes and bodybuilders use the drug due to its thermogenic and anti-catabolic effects. This is down to its ability to slightly increase the body’s core temperature, thereby raising calorie (energy) expenditure. It is thought that a 1°F increase yields around a 5% increase in maintenance calories burned. Studies on livestock suggest that clenbuterol also has anabolic properties.
Clenbuterol exerts further action promoting fat burning, it helps burning fat without the need to make a diet by slightly increasing the body temperature, thus prompting the body to use fat as fuel.