A computational in vitro and in vivo study on citrus peels showed that naringin (56) could have potential activity in preventing cytokine storms of COVID-19 and naringin (56) and hesperetin (55) had strong binding affinity to the ACE2 (Cheng et al., 2020a; Cheng et al., 2020b). Here, ACE2 is linked to COVID-19.