Promote cardiovascular protection with Jarrow Formulas(R) Quercetin! Quercetin is a flavonol (a subclass of flavonoids) and is a potent antioxidant helping to enhance cardiovascular health. Quercetin is one half of the rutin molecule another flavonol and is the more active antioxidant. Each capsule delivers 500 mg of quercetin. No wheat gluten soybeans dairy egg fish/shellfish peanuts/tree nuts or sesame.