Quercetin significantly reduced FIS levels, FBG levels, HOMA-IR, cholesterol levels, TG levels, T levels, LH levels, LH/FSH ratios, VEGF levels and MDA levels in women with PCOS and increased SOD levels and the expression of GLUT4 mRNA compared with those in the model group. This evidence concerns the gene SLC2A4 and polycystic ovary syndrome.