Why Chinese Fentanyl Factories Are Making Peptides Now

The world’s biggest chemical industry is in China. For years, Chinese factories have also been a major producer of ingredients used to make fentanyl, the synthetic opioid that has contributed to thousands of deaths in the U.S. After a recent crackdown in China, WSJ’s Patricia Kowsmann reports that some of those same factories are now entering a new booming U…