Ziwan (Asteris) Essential Oil is extracted from dried roots and rhizomes of Aster tataricus L. f. It can moistens the lungs and relieves Qi, eliminates phlegm and relieves cough. It is used for wheezing and coughing with a lot of phlegm, new and long-term cough, and coughing up blood due to fatigue.
Modern research shows that Ziwan Essential Oil can antitussive, antiasthmatic, antibacterial, antiviral, anti-tumor, antioxidant and diuretic, etc.
Usage: 1-3 drops each time
Note: 
Use caution for those with excessive heat;
Avoid copper and iron utensils.