Jarrow Formulas Bilberry + Grapeskin Polyphenols is a synergistic blend of standardized flavonoid antioxidants. The Swedish bilberry extract provides 25% polyphenols as anthocyanosides. The red grapeskin extract provides 30% polyphenols, including anthocyanins. These flavonoids support the integrity of the capillaries and other blood vessels in the eyes.