- Used since Ancient Egypt - Extract of olive leaf (olea europaea) - Standardised for 27mg oleuropein - Convenient tablet - easier than tea! First used in Ancient Egypt, and believed to be a symbol of heavenly power, the leaf of the olive tree (olea europaea) are a popular botanical supplement. Often used in herbal teas, the easiest way to use olive leaf is in extract form, and each Lindens Olive Leaf (27mg Oleuropein) Tablet contains 450mg of a concentrated standardised extract of Olive Leaf, standardised to provide 27mg oleuropein, all in a convenient, easy swallow tablet.