Inclusion Criteria:  Age 18-60 years Positive nasal swab test of coronavirus disease 2019 (COVID-19) (reverse transcriptase-polymerase chain reaction (RT-PCR) เป็นบวก (cycle threshold <40)) Mild symptom with normal chest radiograph No history of Chronic Obstructive Pulmonary Disease (COPD) and other chronic lung diseases, Chronic kidney disease (CKD), Cardiovascular diseases and congenital heart diseases, Cerebrovascular diseases, Poorly controlled diabetes,BMI > 35 kg/m2, Cirrhosis, Immunocompromised condition Can read and write Vulnerable to participate  Exclusion Criteria:  Allergic history to longan Uncontrollable disease status Pregnancy or lactation Participated in other studies