Our expert says:
According to research findings, resveratrol is mainly found in red grape skins, so the concentration in drinks made from such red grapes would depend on how long the juice is exposed to the red grape skins during processing. While red wine contains about 1 mg of resveratrol per 150 ml glass on average, the concentration in red grape juice would probably be lower because the juice is not left to ferment in contact with the skins. I have not seen any figures for resveratrol content of red Grapetiser yet, but would surmise that it is also lower than in red wine.
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