Working with international regulatory and law enforcement authorities, the FDA participated in an early June crackdown on websites that illegally sell potentially harmful unapproved prescription drugs to US consumers.
As part of Operation Pangea IX, the Ninth Annual International Internet Week of Action, the FDA sent formal complaints to domain registrars asking them to suspend 4402 websites. Included were 110 websites that sold the chemical 2,4-dinitrophenol (DNP) as a weight loss product. Most often used as a dye, wood preserver, and herbicide, DNP has never received FDA approval for use as a drug (http://1.usa.gov/1UDxltm).
Voelker R. FDA Tackles Cyber Drug Crime. JAMA. 2016;316(5):485. doi:10.1001/jama.2016.9809