An antioxidant extract (Vitis vinifera), with no dose disclosed.
Grape Skin Extract, from Vitis vinifera, is a source of polyphenol antioxidants studied for cardiovascular and circulatory support.
Typical studied intakes for grape skin/seed extracts run around 150mg daily on their own.
As part of the undisclosed 570mg blend, we can't confirm the actual amount used in Vasoryn.