Quercetin is a flavonoid (natural dye) and is known as a powerful antioxidant. It occurs naturally in citrus fruits, broccoli and asparagus. Since our bodies do not naturally produce this substance, it is essential to get it from nutrients and supplements. Purovitalis has developed unique capsules encased in liposomes. These liposomes behave the same as our body cells, allowing the quercetin to be optimally absorbed by your body.