Olive leaf extract is made from the leaves of the green olive tree (Olea europaea). Extracts from the leaves of the olive tree contain unique compounds that possess a natural ability to inhibit the growth of numerous viruses, bacteria, and other microorganisms. Olive leaf may also have antifungal properties that can help maintain a healthy balance of microorganisms in the intestines. Olive leaves have long been touted as an antidiabetic agent in herbal folklore. Olive leaf may also be of benefit to people suffering from chronic fatigue, fungal infections, herpes I and II, dental infections, shingles (herpes zoster) and recurring urinary tract infections.