Olive leaf is commonly used for respiratory infections and is antimicrobial. It’s been used to strengthen the immune system as a preventative measure as well as aiding the body to help actively fight bacterial, fungal and viral infections. It works on the cellular level mainly due to its oleuropein. Another great benefit of olive leaf is even though it is antibacterial, it only deactivates bad bacteria while protecting the good bacteria. Olive leaf protects the cilia-which are part of the cells in the lungs.The Berberine in the Olive Leaf is a great anti inflammatory, which is needed especially in the lungs.