Liquid Concentrate Blended with Acai, Mangosteen, Pomegranate, Goji Berry, VitaBerry plus other Super Fruits Free Radical Scavenger Resveratrol is a polyphenol naturally found in the skin of red grapes, certain berries, and other plants. Recent research has shown that resveratrol can support healthy cardiovascular function through its ability to quench reactive oxygen species, as well as through its ability to promote a healthy response to normal biological stress. NOW Resveratrol Liquid Concentrate also has naturally occurring proanthocyanidins (OPCs) from grape seed extract, VitaBerry, acai, cranberry and pomegranate which complement resveratrol’s cellular and cardiovascular support properties.