Cinnamon Bark | Rou Gui Chinese Herb that Warms the Interior and Expels Cold - Medicinal Grade Chinese Herb 1 Lb - Plum Dragon Herbs Rou Gui or Cinnamon Bark is one of the Hottest Herb in the Materia Medica Geo authentic herbs, sulfur free, lab tested and sourced indigenously It is useful for warms the Interior, Expel Cold, relieves pain and number of ailments It is acrid and sweet and has a very hot energy Medicinal Grade Chinese Herb