Grapes, grape juice, and wine generally have high concentrations of polyphenols, including anthocyanins, stilbenes, and flavanols. The compounds are more prolific in grapes with darker skins. Numerous scientific studies show polyphenols in grapes, grape juice, and wine help increase antioxidant defenses, inhibit inflammatory processes, and regulate blood pressure. Polyphenol content varies widely among types of grapes and their derivatives.

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