(Joel Carillet/Getty Images) One review and analysis combined data from 12 experimental studies with 819 participants in total. Overall, olive leaf extract improved risk factors for heart disease.

Olives and olive oil contain this too, but at lower levels. Generally, the greener the leaf (the less yellowish) the more oleuropein it contains. Leaves picked in spring also have higher levels ...

Olive leaf extract is becoming a popular supplement for boosting immunity and general health. It contains antioxidants and health-promoting substances. Studies suggest benefits for heart health ...