The Food and Drug Administration is warning consumers not to use any dietary supplement claiming to treat or prevent a concussion.  

The agency also issued a stern warning this week to sellers of such products to stop making claims they can help someone avoid getting a concussion or recover from one more quickly.  

Medical experts say there is no evidence these supplements work and think they've come on the market due to heightened public awareness about concussions.  

The FDA says any athlete thinking a supplement might help a concussion heal faster runs the risk of resuming their sport too soon when rest is critical to the healing process.