Grape seeds are an excellent source of oligomeric proanthocyanidins (OPCs) and have been the subject of clinical research in France for their antioxidant activity. Antioxidants play an important role in the development of collagen including skin, connective tissue and vascular walls.* nature's Way Standardized Grape Seed Extract is a high potency (955) polyphenol extract. Nature's Way Standardized Extract are technically and scientifically advanced herbal product. Standardization of an extract assures specific measurable levels of the important compounds that give the product their beneficial activity in the body.