Citrus Bioflavonoids are powerful polyphenolic compounds found in lemons, limes, oranges, grapefruits, and tangerines. Bioflavonoids serve to protect cells from free radicals that can damage DNA and compromise the life cycle and functioning of cells and systems of the body. Among the many attributes of Bioflavonoids is their ability to support a healthy immune system response and to promote the maintenance of a healthy vascular system. This product is enhanced with Vitamin C for its synergistic effect.* From the FDA website: "Some scientific evidence suggests that consumption of antioxidant vitamins may reduce the risk of certain forms of cancer. However, FDA has determined that this evidence is limited and not conclusive."