Canelo Alvarez tests positive for clenbuterol I know clen is technically horse asthma meds. Does anyone buy the cow meat excuse? I may change my prediction to ggg, not because Canelo might be cheating, but now that he's caught maybe he changes his regimen up doesn't take what he normally takes and has gotten away with. I dunno. I've just come to the conclusion that all pros take something. Some just don't get caught.