Quercetin is a heavily researched bioflavonoid which is found naturally in many fruits and vegetables, although levels are highest in apples and onions. Our Quercetin includes 100 mg of Bromelain per capsule to help improve Quercetin s absorption. Quercetin is a potent antioxidant and is believed to help support immune system health. Quercetin has also been shown to be a zinc ionophore, and when taken with Zinc it can help increase intracellular zinc levels. We also have Quercetin in a great tasting gummy form with added Zinc!