Olive (Olea europar) is a Olea plant in the Oleaceae family, belonging to the Olea genus. It is a small evergreen tree and fruit producing species, and is one of the world's four major woody edible oil tree species along with oil tea, oil palm, and coconut. Olive leaves have been widely used in folk medicine for thousands of years in Mediterranean coastal countries. Historically, olive leaves have been used in hypertension, gout, atherosclerosis, rheumatism, paralysis, baldness, abdominal colic, diabetes, malaria, fever and other diseases, and have been written in the European Pharmacopoeia. Modern plant therapy uses olive leaves to improve hypertension and act as diuretics. Many in vitro and in vivo studies support the blood pressure lowering, blood glucose lowering, antimicrobial, and antioxidant effects of olive leaves....