Established 1971 Certified Gluten-Free 150 mg Olive Leaf Extract: 18% Oleuropein Possesses Antioxidant Properties Dietary Supplement Kosher Parve — Our Pledge of Integrity — Authenticity Cleanliness Freshness Consistency Accuracy Olive Leaf Extract contains a standardized measure of 18% Oleuropein, a phenolic compound possessing antioxidant properties which is found in the olive leaf. Olive Leaf Extract is a Mediterranean-inspired herbal supplement with known antioxidant properties.