“…To the best of our knowledge, there is no guideline regarding the use of HM to treat the vaccine side effects. There have been four Korean studies since 2016 describing the side effects of vaccines [12] , [13] , [14] , [15] ; but no study has reported on the use of HM with vaccines. Therefore, this study investigates the use of HM to counter the side effects of COVID-19 vaccines in Republic of Korea.…”