Inclusion Criteria:  participants over 20 years of age positive for nasopharyngeal swab reverse transcriptase polymerase chain reaction (RT-PCR) for COVID-19 blood oxygen saturation (SpO2) > 93%.  Exclusion criteria:  pregnant and breastfeeding women individuals confirmed to be allergic to milk protein those with a medical history of bronchial hyperactivity or pre-existing respiratory diseases ICU inpatients with COVID-19.