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 NFL is banning the use of smelling salts during games, citing safety concerns and the potential to mask concussion symptoms.