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.