The demand for semaglutide, a GLP-1 drug, and other popular prescription weight-loss drugs is adding to the U.S. FDA’s regulatory load as more and more companies are offering unapproved knockoffs of the products directly to consumers. The FDA posted two warning letters Feb. 13 – to Miami-based US Chem Labs and a New-York company, Synthetix Inc. doing business as Helix Chemical Supply – citing the companies for misbranding unapproved semaglutide and tirzepatide, also a GLP-1 drug, by marketing them on the Internet, along with claims about their therapeutic benefits.