Inclusion Criteria:  Adults. Confirmed SARS-CoV-2 diagnosis (positive polymerase chain reaction by nasopharyngeal swab). Mild to Moderate COVID-19 patients. No history of the current use of olive leaf capsules supplement.  Exclusion Criteria:  Severe and critical COVID-19 patients who need hospitalization. Patients need ventilatory support or showing chronic obstructive pulmonary disease (COPD). Patients showing any chronic disease (except hypertension and diabetes mellitus). Patients who have multiorgan failure.  3. Use of alcohol, other investigational medicines, and illegal drugs (during the last 30 days).