For centuries, Ugandans have used herbs to treat the symptoms of malaria. Although experience shows that they are effective, their safety has never been tested. Grace Nambatya-Kyeyune is determined to remedy this. Nambatya is director of research at the state-run Natural Chemotherapeutic and Research Laboratory (NCRL). Together with clinicians at Mulago hospital in Kampala, she is evaluating the toxicity of several herbal formulations used to combat malaria.