New & Improved Standardized 18% Oleuropein Herbal Supplement Kosher Parve Gluten Free Vegan Sustainably Wildcrafted Bluebonnet's Standardized Olive Leaf Herb Extract Capsules provide a standardized extract of oleuropein, the most researched active constituent found in olive leaf. A clean and gentle water-based extraction method is employed to capture and preserve olive leaf's most valuable components. Available in easy-to-swallow vegetable derived capsules for maximum assimilation/absorption and for a truly vegetarian/vegan formula.