Licorice (Glycyrrhiza glabra L.) belongs to family Leguminosae, is native to central-western Asia. The root and rhizome are extensively used in herbal medicines for their emollient, anti-inflammatory, anti-viral, anti-allergic, anti-oxidant, gastro-protective, and anti-cancer properties. In China, the plant is also known as a great harmonizer, since it is assumed that it combines the properties of all medicinal herbs. About two-thirds of all traditional Chinese formulations include licorice. Biological active ingredients in licorice include flavonoids, glabridin, glycyrrhetinic acids and the natural sweetener glycyrrhizin etc. It is widely used in food, confectionery and pharmaceutical products, such as cough syrups, herbal supplements, chewing gums, drinks, and candy.