Quercetin is a flavonol (a subclass of flavonoids) and is an effective antioxidant; providing cardiovascular support by reducing oxidation of LDL.* Quercetin is one half of the rutin molecule; another flavonol; and is the more active antioxidant.*Keep out of the reach of children.Jarrow Formulas Quercetin, Cardiovascular Support, 500 mg, 100 Veggie CapsSupports Antioxidant Status: Quercetin is a phenolic antioxidant found in green leafy vegetables, onions, apples and cherries.Cardiovascular Health: Quercetin supports cardiovascular health by supporting blood vessel endothelial cellular integrity and function.Immune Health: Quercetin has been shown to be one of the most bioactive flavonoids that supports a healthy immune system response.Veggie Caps : Adults take 1 veggie capsule per day with meals or as directed by your qualified healthcare professional; Vegan; Vegetarian; Certified Non-GMO.Superior Science: Smarter Formulas – Informed by strong scientific research: Jarrow Formulas products are carefully crafted to ensure you get the benefit of each and every vitamin, mineral and supplement.