For Immune Support. Herb Pharm Whole Leaf Olive Extract comes from the mature leaves of Olea europaea trees which are Certified Organically Grown. To assure optimal extraction of oleuropein & other bioactive compounds, the leaf is hand-harvested, is carefully shade-dried, and is then thoroughly extracted. All of Herb Pharm`s Liquid Herbal Extracts are prepared according to precise Good Manufacturing Practices and with individualized formulations or processes which enable each herb to be extracted according to its own unique physical and biochemical characteristics. This attention to detail produces a finished extract which optimally represents the herb from which it was made. Herb Pharm`s extracts are very rich in the aroma taste and bioactive compounds of the original herbs themselves. They use pharmaceutical-grade certified organic alcohol to make over 80% of their liquid herbal extracts.