Olive Leaf Extract Capsules - 18% Oleuropein 400mg - Kosher Vegan with Organic Olive LeafHigh Potency Olive Leaf. 90 Kosher Veggie Capsules Now with 185mg Olive Leaf Powder and 215mg Olive Leaf Extract. The olive tree (Olea europaea) is a small tree with edible fruit, typically found in Africa and southern Asia. The leaves are slender and graceful with a dark green hue on top and a silver tinged underside. Oleuropein, the active compound in olive leaf, is a powerful antioxidant that may possess antibacterial, antifungal, antiviral and