Olive leaves and flowers (of the olive tree Olea europaea) contain a range of very powerful antioxidants with free radical scavenging properties. The active compounds have been shown to have anti-viral, anti-bacterial and anti-fungal properties. They also have mild astringent properties and have been used traditionally to help relieve fevers, colds flu, and yeast infections. Olive leaf is also good for the heart and has been shown to reduce cholesterol and high blood pressure. Its immune stimulating effects are believed to come from Oleuropein.