Allergy Research Group has offered Artemisinin to the U.S. for over 30 years, and independent tests have proven its efficiency. Its active constituent Qinghaosu, also known as pure Artemisinin, contains 0.3-0.5%, delivering magnitudes more than the whole herb. Upon every batch, we conduct independent potency assessments via HPLC. Our Artemisinin is guaranteed to be at least 98.5% pure, without a trace of thujone.