The NFL sent a memo to teams Tuesday banning all forms of ammonia inhalants and smelling salts from games, pregame activities and halftime, following an FDA warning about their unproven safety and efficacy.

The NFL has officially cracked down on the use of smelling salts during games—but players aren’t completely out of luck.

Ammonia and smelling salts have long been used as a stimulant by NFL players as well as other athletes, though the risks that come with their use have been noted. Many boxing competitions, for instance, have banned smelling salts under the pretense that their use can mask serious injury.

The ban that the league informed teams about on Tuesday only prohibits team employees from distributing smelling salts.

The NFL is making moves to address the use of smelling salts in the game. Find out what’s changing and why this could impact players moving forward.