The main components of olive leaf extract are flavonoids, terpenoids and their derivatives, aromatic compounds, aliphatic compounds, phenolic acids and so on, among which flavonoids, terpenoids and their derivatives are the main active components. It has many pharmacological effects, such as lowering blood pressure, lowering blood glucose, antioxidant, antithrombotic, antibacterial, antiviral, anti-microbial and anticancer, etc. It is widely used in medicine, cosmetics and food supplements.