Cellucor C4 Mass is a pre workout supplement with the addition of a proprietary Carbohydrate Blend.Carbohydrates help to increase insulin levels which moves Creatine and other essential nutrients to the muscles. These nutrients are then used to support muscle growth and maintenance. Carbohydrates also help to fuel the body during intense exercise and replenish glycogen stores after training.Creatine has been added to for its role in increasing physical performance in successive bursts of short-term high intensity exercise. Caffeine has been included to provide mental and physical focus.Cellucor recommend consuming one serving of C4 Mass twenty to thirty minutes before exercise. This can be increased to two servings once tolerance has been assessed.