Benefits of Olive Leaf;    The olive tree has been referred to as "The Tree of Life", and this should be included in every diet for the maintenance of good health and for the prevention of disease. Olive tree's produce oleuropein abundantly in its leaves, as well as in the fruit. That means consumers can have access to one of the most beneficial components of olive oil, without using excessive amounts of it for our health. The leaves are best known for their ability to lower high blood pressure naturally. Additionally, anti-inflammatory and antioxidant properties offer promise in the fight against heart disease, stroke, cancer and neurodegenerative disease. such as Alzheimer's disease and Parkinson's disease. It is 400% higher in antioxidants than Vitamin C, and the herbal extract has been used in traditional medicine for centuries to improve age-related disease and promote longevity. According to findings in laboratory studies, Olive leaf extract is effective in fighting organisms like bacteria, fungi, viruses, and protozoa. Olive leaf has been used for candida, hyperacidity, peptic ulcers, colds, flu, malaria, dandruff and obstinate fevers.  Studies have shown olive leaf tincture to decrease blood sugar levels by 17 - 23%.   
Free radicals cause oxidation in the body, which is why antioxidants, like vitamin C, vitamin E and Olive Leaf extract can play a major role in the fight against them. It appears to stimulate phagocytosis, and by interfering with the ability of bacteria and   viruses to replicate themselves and cause infection. Free radicals can leave the body vulnerable to advanced aging degenerative disease and cardiovascular problems. 
Olive leaf is shown to have an antioxidant capacity almost double that of Green Tea extract and 400% higher than the equivalent amount of vitamin C. These properties are contributing to the effects, especially on inhibiting (LDL) or "bad cholesterol", that is often connected to various heart problems. Other research has demonstrated that it may significantly decrease blood pressure and increase blood flow through the coronary arteries. Used as an aid to good heart health, the herb is believed to normalize arrhythmias and boost circulation thereby relaxing arteries. 
Some of the most amazing anti-tumour results have been reported in science studies.  When oleuropein was administered orally to mice that had developed tumours, and they were shown to have regressed in 9 to 12 days. And its not just cancer that the Olive Leaf extract approaches, another study conducted by the New York University School of Medicine showed that it changes the pathways of HIV-type infections such as herpes and shingles (herpes zoster) as well, and may even help to reverse these conditions. Among these conditions are meningitis,   Epstein-Barr Virus (EBV), encephalitis, tuberculosis, gonorrhea, malaria, dengue, bacteremia, severe diarrhoea, dental, ear, urinary tract and surgical infections, and blood poisoning. Long-term use of Olive Leaf extract may work for you as a preventative agent.