The National Football League and its players’ union have requested industry research on CBD and other cannabinoids for pain management.

The NFL says it is looking for information about “alternatives to opioids in routine pain management.” The request mentions CBD but is open to research on other cannabinoids.

The request issued Wednesday also mentions research on the “impact of cannabis or cannabinoids on athletic performance.”

The memo comes five months after the NFL Players Association updated its policy to discourage athletes from endorsing products that contain CBD or other cannabinoids.

The research is requested by March 31. The NFL asks submitters to label proprietary information and that no compensation is offered for the information.