Common Brunella, sometimes called Comfrey or Sloe, is a plant native to Europe. It is well known worldwide for its medicinal properties: its thorn, Xia ku cao in Chinese, is particularly recommended for its benefits on the respiratory sphere.

Indeed, it eliminates toxins from the body and effectively relieves the manifestations of cold stroke. In TCM, it eliminates excess heat in order to soothe headaches and irritated eyes and it purifies the respiratory tract in order to encourage the expectoration of mucus.