Clenbuterol hydrochloride , or sometimes referred as Clen, is not a steroid but a bronchodilator and central nervous system stimulant. It is a very particular agonist that excites the adrenergic beta 2 receptors. It is an extremely universal bodybuilding course effective treatment for the patients of asthma. Apart from being an incredible treatment for asthma, Clen is also an effective fat burning substance. It is used as a thermogenic substance. Indeed, the use of Clen as a fat burning tool is relatively higher than its use as a treatment for asthma. Most of the anabolic steroid users use Clen when they are preparing for any competition. Since Clen is an adrenergic beta 2 receptors stimulant, it removes all the airways obstacles and the breathing is significantly improved. Clen can also be effectively used to increase the metabolic rate. This can be achieved by stimulating the beta 2 receptors which increases the body temperature and the rate of burning calories is enhanced. Clen does not burns fat itself, it rather speeds up the process of fat burning in the body.