From the Manufacturer:
Olive Leaf is known to have powerful anti-fungal and anti-bacterial properties. It has been used extensively to help stave off colds and flu and may have antioxidant properties as well. Scientists believe that many of the benefits of olive leaf are due to a nutrient in the olive leaf named oleuropein. Inferior brands of olive leaf extract can have very low levels of this nutrient due to the way that they are processed.
Our Standardized Olive Leaf Extract is produced by a European phytopharmaceutical company and is manufactured under strict European quality control standards without the use of harsh solvents. Like all European herbal extracts, the extraction of our Olive Leaf Extract is regulated to the same high standards as over-the-counter drugs. It is meticulously extracted to provide the optimal level of 12-16% natural occurring oleuropein. Our Standardized Olive Leaf Extract contains a full spectrum of components as they occur naturally in Olive leaves.