Grape seed extract
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Not to be confused with grapefruit seed extract.
Grape seed extract is an industrial derivative of whole grape seeds. The extract contains proanthocyanidins.[1] Grape seed extract quality is measured by the content of procyanidins which are formed from proanthocyanidins.[2] Generally, grape seed extract quality contains 95% procyanidins, but potency varies among products.[3] Eating foods or beverages high in procyanidin results in an astringent sensation in the mouth.[4]