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Resveratrol does many things for everyone. Blood pressure, cholesterol, immune system, and it has even shown to extend life expectancy in worms and mice by 20%.
The component of grapes that has the resveratrol content is the skins, which is why red wine has more than white wine.
However there are other plants that have far higher levels of resveratrol than grapes have, like 'Fallopia japonica'.