Grapes and grape products, especially those made from the skins and stems of grapes, are good sources of flavonoids. Red Grape Skin extract contains a mix of substances, some of which are found in grape seeds and some in red wine. These substances include non-bioflavonoid polyphenols (derivatives of cinnamic and benzoic acid) and bioflavonoid polyphenols (quercetin, catechins, flavonols, and anthocyanins).

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