Compounded versions of semaglutide, the active ingredient in approved diabetes and obesity drugs Ozempic and Wegovy, have been associated with at least 100 hospitalizations and 10 deaths, the chief executive of Ozempic maker Novo Nordisk warned Wednesday.

Novo Nordisk addresses safety concerns surrounding compounded versions of its weight-loss and diabetes drugs, including reports of deaths and hospitalizations, while working with the FDA to resolve issues.

Honestly, I’m quite alarmed by what we see in the U.S. now,” Novo Nordisk President and CEO Lars Fruergaard Jorgensen told CNN on Wednesday. “Patients who believe that they’re getting access to a safe product,