Clen is not legal in the US and doctors do not prescribe it. Where doctors in other countries prescribe Clen for breathing disorders , doctors in the United States generally prescribe Albuterol. As such, finding Clenbuterol for sale may be a little difficult. There are underground laboratories that produce liquid Clenbuterol for injection or oral dosing, and some even produce the tablets. This is dangerous since you have no way to know the concentration of Clen in these substances. Most often, people buy Clenbuterol online because it is safer and more discreet. Please be aware of potential legal problems associated with the use, possession, purchase, or sale of Clen in the US.