Olive Leaf Extract is a natural botanical product that has been a subject of study since the early 1800's. This specific extract of olive leaves (Olea europea) is manufactured under strict quality control conditions and is standardized to contain a minimum of 18% Oleuropein, a bitter glucoside, and other active constituents.&ampnbsp; We add synergistic Echinacea angustifolia to complement the standardized Olive Leaf.&ampnbsp; Echinacea is a Native American herb that was once widely used by the Plains Indians and is now used by millions of consumers worldwide.