Olive leaf extract derives from the olive tree (also known as Olea Europea and the Tree of Life), a small tree native to the Mediterranean, Southeastern Europe, and much of the Middle East This tree has long been prized for both olives and olive oil, and has a history of use stretching back many thousands of years. It is one of the best known botanicals in the world.
Nowadays, doctors commonly advocate the "Mediterranean diet," which heavily emphasizes olive oil. Because of the famous protective cardiovascular effects of olive oil, until recently doctors have tended to overlook the olive tree’s other components, such as its various polyphenolic compounds, including oleuropein and hydroxytyrosol, and their possible healthful benefits. Thanks to emerging research, this has begun to change.