No, quercetin and CoQ10 (Coenzyme Q10) are distinct compounds with different functions. Quercetin is a bioflavonoid with potential antioxidant properties and is found in various food sources like red onions and apples. On the other hand, CoQ10 is a coenzyme found naturally in the body and is essential for energy production within cells. Both have been studied for their potential health benefits, but they serve different roles in the body.