Dietary supplement. Official supplement of the UFC Ultimate Fighting Championship. Xyience Xtko is a non-addictive formula developed to help promote rest and recovery. It contains ingredients identified by clinical research to help promote relaxation, reduce stress, and improve sleep quality. Allergen free of yeast, corn, soy, wheat, lactose, citrus, milk, egg, & fish products. No sugar, salt, starch, artificial coloring, flavoring, or preservatives added. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent disease.)