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Antioxidant SupportStandardizedHerbal SupplementStandardized to 90% PolyphenolsOffers Antioxidant Support to Neutralize Free Radicals and Fortify the Body's DefensesScience-Backed Quality Since 1969You may have read the studies linking wine consumption with good heart health. But did you know it could be a lot easier (though perhaps not as much fun) to get antioxidants for your heart with Swanson Grape Seed Extract? Grape seeds have compounds known as polyphenols considered among the most potent free radical fighters known. We've standardized our extract from California grapes to deliver a guaranteed potency of 90% polyphenol concentration.