Pure Quercetin is a natural flavonoid that the human body does not produce itself, but is found in a lot of colourful plants in small amounts. Pure Quercetin is a bioflavonoid that supports immune system health. It is a potent antioxidant that can activate sirtuins, increase resveratrol efficiency, reduce senescent cells and support healthy cholesterol. At DoNotAge we use dihydrate as this is the most effective. As you will see from the video below, many people find this product vital for many reasons, including its ability to support healthy sinuses and respiration. Each capsule contains 400mg of pure quercetin. https://donotage.org/app/uploads/2021/06/ClaudiaQuercShort.