It blows my mind how a forum like this can be so enlightened on pro bodybuilding but in the dark when it comes to supplements.
So often you hear something along the lines of "Supplements are a scam, that's why I only take X, Y, Z, A, B, C, D, E, F."
Look at your pre-workout. It's caffeine.
Caffeine works and it's in just about every "energy booster" laced with god knows what else. What a joke.