In clinical research 150–300 mg of Artemisia annua extract twice daily has been used for up to 9 months for symptoms of arthritis.^[6][7] In another clinical study, sublingual drops of glycerinated pollen extracts of Artemisia annua at a dosage of 2400 biological units daily for up to 32 weeks reduced symptoms of allergic rhinitis.^[8] Historically, Artemisia annua leaves have been consumed as a vegetable in Western Asia.^[1]