Nutrition, Metabolism and Body Composition
C4 Extreme NCAA legal?
The best way to know is contact the NCAA directly. I am assuming it is banned. The first thing on their banned list are stimulants and C4 Extreme contains caffeine and synephrine. I would advise them not to take it. It may work great as a pre-workout, but why take the chance with NCAA regulations-it's not worth it.
I hope this helps!