Clenbuterol is a prescribed Asthma medication which is catabolic to fat and anabolic to muscle. Clenbuterol’s most valid application seems to be as a pre-contest, cutting drug. It is a Beta-2 adrenergic agonist. This means it acts just like adrenaline (epinephrine) at a certain type of receptor named Beta-2.
Effective Dose: Clenbuterol is used at 60-120 mcgs per day, divided throughout the day. 2 days on, 2 days off / 2 weeks on 3 weeks off.
Cycles usually last 6-12 weeks. After 2 weeks, the Beta-2 receptors down regulate and impairment of T4 to T3 conversion is impaired. Research shows that using it for two days on then two days off prevents attenuation. Apparently, clen has a half-life in the body of 48 hours making it pretty much irrelevant when you take it. This means that two days on, two days off, conserves the number of pills you use in a cycle rather than for receptor downgrade which occurs around two weeks. The three weeks off between cycles counterbalances the receptor downgrade; the two days on, two days off reduces the side effects since on the third day of two-on two-off the concentration is highest.