Xtreme Super Pre-Workout. 350mg Caffeine. 3.9G Matrix. STIMUL8 Hardcore Is an Xtreme Super Pre-Workout built to promote extreme energy, pump, and endurance during workouts! The unique STIMUL8 Hardcore formula is powered by an exotic blend of energy and performance-enhancing ingredients designed to deliver the results you need to make it through even the most difficult activities. REDEFINE YOURSELF with STIMUL8 Hardcore!