Olive Leaf originated in the Mediterranean region and is a staple of the Mediterranean diet. Olive leaf extract has antioxidants called polyphenols. One of the polyphenols is oleuropein. Oleuropein has anti-inflammatory, antiviral, and antimicrobial benefits. It may help with cholesterol levels and inflammation. Olive leaf extract may support the immune system. The antioxidants in olive leaf may support healthier blood pressure levels.