Contains chemical constituents such as proanthocyanidins, polyphenols, flavonoids, and anthocyanins, all of which are very potent antioxidants that help to diminish environmental damage. Grape extract has also been shown to have soothing properties. Red grapes contain resveratrol, considered a very potent antioxidant.
References for this information:
Indian Journal of Experimental Biology, April 2016, pages 280-285
Cosmetics, August 2015, pages 259-276
Nutrients, January 2014, pages 391-414
Pharmacognosy Review, July-December 2011, pages 164-173