Release the Exterior (jie biao)

Cooling and warming pungent herbs that treat conditions of exterior wind-heat and wind-cold, respectively, typically via promoting perspiration. These herbs stimulate the immune system and are commonly used in cases of the common cold and influenza. gui zhi (Cinnamomum cassia) warms and treats exterior wind-cold and bo he (Mentha haplocalyx) cools and relieves exterior wind-heat.