What is Doctor’s Best Artemisinin? Doctor’s Best Artemisinin contains high quality Artemisinin or Ching-hao, an extract from the traditional Chinese herb Artemisia annua (sweet wormwood). Ching-hao has been used for over 2,000 years to normalize digestive complaints. The whole herb extract is consumed in many countries for digestive health. Why take Doctor’s Best Artemisinin? Doctor’s Best Artemisinin is made in the U.S. with the high grade artemisinin. It is extracted from plants grown and harvested in accordance with GAP (Good Agricultural Practice) standards. The extract is manufactured to high quality specifications in a certified GMP (Good Manufacturing Practice) facility, ensuring its high potency.