Olive leaf infusion helps manage symptoms of diabetes and keep blood sugar levels stable, and research studies have supported its effectiveness. Oleuropein, one of the compounds present in the olive leaf, has been particularly popular among scientists. It fights bacteria, viruses and fungi as well as several different kinds of internal infections. Oleuropein has shown a number of different properties designed to help with lowering blood pressure. It also slows lipid oxidation in the blood, thereby reducing the danger of cardiovascular disease. Olive leaf extract also contains luteolin and apigenin, two chemicals that combat cancer, as well as cinchonine, which takes aim at malaria. Finally, it fights inflammation, which plays a strong role in degenerative medical conditions. It may even provide some help for stroke patients.