The bilberry plant is a low-growing, black berry-producing shrub that's closely related to the blueberry plant. Its berries are commonly used for cakes, pies, jams and other culinary treats, but it's also used in supplement form for its fantastic health benefits. Chief among the reasons for taking a bilberry supplement is that it boosts eye health. This formula includes four key ingredients, bilberry, quercetin, rutin and eyebright 4:1 extract. Swanson Bilberry Eyebright Vision health supplement contains 350 mg Bilberry from Vaccinium myrtillus (fruit), 105 mg of quercetin from Sophora japonica (flower buds), 70 mg of rutin from Sophora japonica (flower buds), and 43.75 mg eyebright 4:1 extract from Euphrasia officinalis (herb and leaves).