Immunomodulatory and Preventive Effects of Olive Leaf Tea Against COVID-19

Olive-leaf tea (OLT) is widely used in the traditional medicine in the Mediterranean region. Due to the high concentration of phenolic compounds, of which most abundant is oleuropein, interest in olive leaf has increased recently \[22, 23\]. The components of the olive leaves are known for their immune-modulatory, anti-inflammatory, antioxidant, hypoglycemic, antihypertensive, antimicrobial, and anti-atherosclerotic effects \[24, 25\]. Although its antiviral mechanism of action is not fully known, many studies have been conducted on the antiviral effects of olive leaf extract .