Pure artemisinin or Qinghaosu, the active constituent of the herb sweet wormwood (Artemisia annua), and oil derived from the same plant, total 200 mg of material per capsule. Good quality Artemisia annua contains 0.3-0.5% artemisinin; so pure artemisinin provides hundreds of times more of the active constituent artemisinin than the whole herb itself. Research has shown artemisinin to be particularly beneficial in balancing the microbiology of the GI tract.* NutriCology introduced artemisinin to the U.S. market more than a decade ago. NutriCology does independent potency assays on every batch (using HPLC), and independent tests verify its effectiveness. NutriCology artemisinin is minimum 98.5% pure, and does not contain thujone.