Platycodon GrandiflorumPlatycodon grandiflorum(Chinese bellflower) The active principals are triterpenoids, sterols and saponins, principally platycodin. Platycodin exerts an expectorant action by increasing bronchial secretions (The Pharmacology of Chinese Herbs, pg 285-6). Traditional uses are to dispel phlegm, to ventilate the lungs, and to relieve sore throat. In traditional Chinese Medicine, it is often used in combination in order to direct the actions of other herbs to the upper body.