Doggrass (Elymus repens) - quackgrass (Agropyron regens), plant poales. Couch grass rhizome (Rhizoma Agropyri) is the source of medical material. It has a number of bioactive components, sugars (fructose, mannitol), inositol, organic acids, essential oil (kapilen, carvone), organic acids, mineral salts (including silica water soluble), vitamin C. Its name is taken from the observations of patients dogs that often dig out and eat the plants rhizome It works diuretic, laxative, detoxificating, antidiabetic, stimulates metabolism. In the sports supplementation it used to remove the subcutaneous water the outside of the body, which improves posture and weight reduction at a fairly rapid time and is important in professional sports played in different weight categories. Rare as the ingredient of weight loss supplements.