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Grape seed extract is an industrial derivative of whole grape seeds. The extract contains proanthocyanidins. Grape seed extract quality is measured by the content of procyanidins which are formed from proanthocyanidins. Generally, grape seed extract quality contains 95% procyanidins, but potency varies among products. Eating foods or beverages high in procyanidin results in the sensation of the mouth puckering and dehydration, otherwise known as astringency, as felt after certain alcoholic drinks.   Wikipedia

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grape seed extract | grapeseed extract | grape seed proanthocyanidin extract | grape seeds extract

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