C4 Sport Pre-Workout energy optimized for exercise. It combines two formulations to support performance and energy into one, so every base of your workout is covered. The performance side includes Beta Alanine to help keep fatigue at bay, Creatine monohydrate for muscle endurance, and Arginine AKG to increase blood flow and keep you going. The energy side contains an explosive blend of 135MG Caffeine and Taurine for unrivaled focus and energy. C4 Sport carries the Informed Choice logo. This means that the product has gone through a full manufacturing audit, and is regularly tested for a wide variety of WADA banned substances to ensure safety for sport.