Antioxidant therapies, such as quercetin, astaxanthin, luteolin, glycyrrhizin, lactoferrin, hesperidin, bromelain, and curcumin, are able to raise the levels of the natural antioxidant, glutathione (which is important for redox balance), which improves the immune response and COVID-19 symptoms [5,19,202,203,204,205,206,207,208,209]. This evidence concerns the gene LTF and COVID-19.