The agency has begun taking action against several companies whose producted promise to prevent or heal concussions.
The military alerted the agency after some soldiers and veterans inquired about supplements marketed to treat traumatic brain injuries.
Now the FDA is warning companies not to make those claims.
And it is warning people not to take the supplements.
Last month, the FDA issued a warning letter to 'Star Scientific.' It claims its product Anatabloc could treat traumatic brain injuries.
The FDA says there's no evidence any herb or vitamin heals concussions.
The best treatment is rest and time.