RETN and Insulin resistance: The first study showed that following supplementation, quercetin significantly decreased resistin hormone levels (p < 0.001), testosterone (p = 0.001), luteinizing hormone (p = 0.035), fasting blood glucose (p < 0.001), insulin (p = 0.02), as well as Homeostatic Model Assessment of Insulin Resistance (p = 0.009) [27].