Grape Seed Extract 100mg by Bluebonnet 30 Capsule GRAPE SEED EXTRACT 100 mg. Vcaps Grape seed extract is a natural plant product rich in oligomeric proanthocyanidins (OPC's) a water soluble bioflavonoid. Indena LeucoSelect grape seed extract is all natural and produced from specially grown OPC rich champagne grapes imported from France. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption. Product No. 838 - 30 Capsules.