Be very very careful. Clenbuterol is a beta agonist using mcg amounts. If you screw up and take too much you may end up in the emergency room with severe tachycardia. That being said clenbuterol is one of the few drugs that not only can increase strength non hormonally but also drops fat and gives energy. Very attractive in my opinion. Nonetheless in lab animals clenbuterol was seen cause ventricular stiffness in the heart. This isnt something to play around with. Nonetheless clenbuterol is legal as an asthma medication in some european countries.