**3. Conclusions**

OLE can reduce both systolic and diastolic blood pressure in human body. The effect of OLE on systolic blood pressure is more significant and mostly depends on the dose of the extract for diastolic part. The anti-hypertensive effect of OLE is mostly due to OL. The two most common methods of OL extraction are maceration and soxhlet. There are special mechanisms with which OL reduces blood pressure. For instance, inhibiting ACE, blocking L-type Ca2+ channels, possessing vasodilator activity by increasing NO bioavailability and having anti-oxidant properties.
