Bluebonnet's Super Fruit Grape Seed Extract Capsules are derived from. Champagne grape seeds imported from France. These special grape seeds are. turned into an extract known as Leucoselect supplying 100 mg per serving of. grape seed extract standardized to 95% total polyphenols including oligomeric. proanthocyanidins, monomeric polyphenols and flavonoids. These potent active. constituents help support circulatory health and protect against the damaging. effects of free radicals. Available in easy-to-swallow vegetable capsules for.