2 Subjects and Methods
The subjects were 4 patients admitted to our hospital under a diagnosis of SARS-CoV-2 virus infection. All patients had positive reactions on polymerase chain reaction (PCR) testing and symptoms such as fever and dysosmia. They were hospitalized as mild-status patients. A supplement containing cystine (700 mg) and theanine (280 mg) at a total volume of 1.5 g was orally administered once a day from X month 15th until discharge in all patients. While continuing standard treatment, the presence of the virus was examined using PCR testing. After confirming negative reactions on two consecutive sessions of PCR testing, which comprised a criterion for discharge, the patients were discharged. We investigated supplement compliance after the start of administration, PCR testing results, and the interval from the start of supplement administration until negative reactions on two consecutive sessions of PCR testing were obtained.