Best Naturals Grape Seed Extract is a highly concentrated natural extract containing a minimum of 95% Polyphenols, including OPC's (Oligomeric Pronto cyaniding), the beneficial antioxidant compounds found in Grape Seeds. Grape Seed Extract and OPC's have been the subject of numerous scientific studies demonstrating their efficacy in the support of cardiovascular health and immune system balance. In addition, non-clinical studies have shown that Grape Seed Extract may protect healthy brain and nerve tissues.