Our exceptional Artemisinin 90 Vegetarian Capsules are made with pure artemisinin or Qinghaosu, the active constituent of the herb Artemisia annua (sweet wormwood). Good quality Artemisia annua contains 0.3-0.5% artemisinin, offering hundreds of times more of the active constituent than the whole herb. Three decades ago, Allergy Research Group introduced artemisinin to the U.S. market—our independent cell tests and HPLC potency assays guarantee each batch is 98.5% pure and doesn't contain thujone!