Sinus Function Support is based on the centuries-old formula called Bi Yan Pian. Magnolia flower, wild Chrysanthemum and Licorice root are combined with invigorating and soothing herbs to rejuvenate the health and well-being of the nasal passages, sinuses, and respiratory system. Appropriate for short term use. Often combined with Bamboo Pharmacy's Winter Defense or Plum Flower's Yin Qiao.