That's right! Trevor's the one. It's theorized, although not proven, that endurance training may increase a person's need for vitamin E. This is because vitamin E is an antioxidant known to counteract free radicals. Free radicals are dangerous compounds that are increased in the body when a person takes in more oxygen than usual, as happens during endurance training. Mario, Mikala, and Beth may not be too happy about losing their argument with Trevor, but that's the way it goes. Let's keep talking about Trevor's vitamin E supplement needs, OK? Click Next when you're ready.