Professor Weather's studies the production in planta (within the plant) of artemisinin and its other therapeutically active phytochemicals for their efficacy in treating malaria and other artemisinin-susceptible diseases. Her research has shown that delivery of artemisinin via powdered dried leaves of Artemisia annua (DLA), either as capsules or compressed into tablets, shows greater bioavailability and therapeutic efficacy against a number of diseases than does the pure drug artemisinin, so use of DLA could offer novel, more cost-effective therapies.