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A main ingredient in these supplements is caffeine. How much caffeine?

135 mg vs. 225 mg

Need a new pre-workout booster? I’ve put together a list of the best to help you find one.

C4 Extreme is currently the best-selling pre-workout booster on bodybuilding.com. I was surprised to find its caffeine content relatively low compared to other pre-workouts. A single serving of C4 Extreme only has 135mg of caffeine. A single serving of Advanced Strength N.O.-Xplode 2.0 has 225mg of caffeine.