Quercetin is a bioflavonoid that is found in many vegetables, fruits, and herbs and is needed for assisting in the absorption of Vitamin C. Naka Platinum Extra Strength Quercetin 500mg is an important antioxidant supplement that protects against oxidative stress and is often used in herbal medicine as a capillary and blood vessel protectant. Extra Strength Quercetin comes in a an easy to swallow veggie capsule and may help support cellular health, provide seasonal allergy relief, and may even support immune health