ABTS, 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid); ACE2, Angiotensin converting enzyme 2; Anti-inflammatory; Antioxidant; Antiviral; CC, Cytotoxic concentration; COVID-19; COVID-19, Coronavirus disease 2019; COX, Cyclooxygenase; DMSO, Dimethyl sulfoxide; DPPH, 2,2-diphenyl-1-picrylhydrazyl; DRC, Dose-response curve; DXM, Dexamethasone; EGCG, Epigallocatechin gallate; ELISA, enzyme-linked immunosorbent assay; Endotoxemia; FBS, Fetal bovine serum; H&E, Hematoxylin and eosin; HPLC, High-performance liquid chromatography; IC, Inhibitory concentration; IFNs, interferons; IL, Interleukin; LPS, Lipopolysaccharide; MTT, 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide; PBS, Phosphate buffered saline; SARS-CoV-2; SARS-CoV-2, Severe acute respiratory syndrome coronavirus 2; SEM, Standard error of the mean; SI, Selectivity index; TNF, Tumor necrosis factor; iNOS, Inducible nitric oxide synthase