Medicinal use of olive leaves date back to ancient Egypt and is referenced by Hippocrates. One of the primary compounds in olive leaf, Oleuropein, has attracted scientific attention since the early 1900s and has been well researched for its health benefits. Used as a health tonic throughout the world today, a steadily growing body of science points to olive leaf complex as worthy of its ancient medicinal reputation. Barlean's olive leaves are sourced from the Andalusian region of southern Spain, well-known for its warm climate and rich soil that allows Olea europaea trees to thrive in their native coastal Mediterranean environment. These healthy leaves are teeming with the powerful antioxidant, Oleuropein, as well as a wide range of natural polyphenols.