Quercetin, an active ingredient common to Cortex Moutan, Radix Achyranthis Bidentatae, and Radix Glycyrrhizae, has been previously shown to inhibit cell proliferation, induce cell apoptosis, counteract inflammation, and regulate estrogen, as well as progesterone receptors on endometriosis autoimplanted mouse models [32, 33]. The gene discussed is PGR; the disease is endometriosis.