What is the legal status of Clenbuterol in the UK and where can you buy some? Clen is one of the most potent fat burner that you can take, however it is hard to come by in the UK. There is still a lot of misconceptions about its legal status of this fat burner among the Brits and looking into bodybuilding forums may make you question more than clear things up. According to the UK law, Clenbuterol is under the classification of Class “C” drug which means it is illegal to be sold by UK companies for human consumption. But, Class “C” drugs can be imported legally to the country if they are for personal use and the ownership as well as the use of Clenbuterol is legal even without a prescription.