Multiple network pharmacological and molecular docking studies have shown that herbal medicines show a high affinity for ACE2, the critical functional receptor for SARS-CoV-2, in the treatment of COVID-19 [27], including formulas (such as Xuebijing Injection, Shufeng Jiedu Capsule, Huashi Baidu Formula, and Maxing Shigan Decoction) [[27], [28], [29], [30], [31]] and active ingredients (such as quercetin, glycyrrhizic acid, and salvianolic acids) [[32], [33], [34]]. Here, ACE2 is linked to COVID-19.