Grapes are a good source of polyphenols
All grape varieties contain polyphenols. Polyphenols are compounds that give grapes and certain other plants their vibrant colors. They also offer protection against disease and environmental damage.

Polyphenols are known antioxidants that help fight free radicals in the body. The grape skins and pulp contain the most polyphenols. They also have the highest antioxidant abilities.