Fructus Perillae. Part used: Seed. Known as Perilla Seed. Entering meridians: Large Intestine and Lung. Su Zi stops coughing, calms wheezing, descends Qi, dissolves phlegm, moistens the intestines and unblocks the stool. All Phoenix Medical dry authentic herbs and concentrated herbal granules are free of sulphur, herbicides and pesticides.