AGTR1 and COVID-19: Some quercetin derivatives are important in mitigating the severity of COVID-19 by acting through endoplasmic reticulum stress or the ACE-Angiotensin–II–AT1 receptor axis (AT1R) pathway [51,52], which is an Nrf2-interacting nutrient that also interacts with TRPA1 and/or TRPV1 [53].