Cellucor C4 50X is a pre workout supplement with 50x more of the key active ingredients that were found in the popular C4 Extreme.It contains Caffeine to support mental and physical focus. Creatine has been included, which with two servings, may increase physical performance in successive bursts of short-term, high intensity exercise. L-Arginine, an amino acid, has also been added. It is a precursor to Nitric Oxide synthesis and may help to improve repair time for damaged tissue.Calcium and a variety of B Vitamins have been added. B Vitamins help to support a range of biological functions which include reducing tiredness and fatigue and supporting normal protein and glycogen metabolism, normal cysteine synthesis and normal amino acid synthesis. Calcium contributes to normal Energy Yielding Metabolism, has a role in the process of cell division and specialisation and is required for the maintenance of normal bones.Cellucor recommend taking one serving of C4 50x twenty to thirty minutes before training. Once you have assessed your tolerance this can be increased to two servings before training.