Oleuropein (the substance that gives the bitter taste to olive) is active against bacteria and insect pests, thus protecting the olive tree. This property has also been found to help protect humans, too.
Moreover oleuropein in olive leaf may help those suffering from osteoarthritis and rheumatoid arthritis, according to a 2007 Arizona State University study reported in Nutrition Research.
Churg-Strauss syndrome is a disorder that leads to swelling and inflammation in the blood The swelling can lead to the restriction of blood flow to key organs. Churg-Strauss syndrome is caused by an overactive immune system, according to MayoClinic.com. While there is no cure, olive leaves can help several of the symptoms, including asthma, fever, night sweats, fatigue and abdominal pain.
Olive leaves are considered a holistic tool to combat chronic fatigue, flu, colds, herpes, fungus and yeast infections, bacterial infections, skin conditions and tropical illnesses.
Other studies have also shown protective capabilities against breast cancer and showed an arrested growth in a tissue culture of human breast cancer cells at an early stage in the growth cycle.
Olive leaf also contains many phenols, antioxidants that neutralize the action of free radicals.
In addition to all these benefits, olive leaf is able to fight the formation of bad cholesterol (LDL) by preventing its oxidation. This oxidized cholesterol is considered the “bad” cholesterol and is detrimental to our health.