Grape Extract The most important ingredients of grapes are: Acids: tartaric, malic, caffeine, cinnamic, ferulic, lactic, oxalic, succinic, pantothenic, ascorbic. Flavonoids: proanthocyanidins, quercetin, catechins, epicatechins, kaempferol. Resveratol (polyphenol present in fruit and leaves). Tannins (mostly in seeds). Carotenoids: carotenes, cryptoxanthin, lutein, lycopene, zeaxanthin. Carbohydrates: galactose, glucose, sucrose, xlyose, raffinose. Vitamins: pantothenic acid, biotin, folic acid, niacin, riboflavin, thiamin and vitamin C. Minerals: calcium, potassium, sodium, iron, phosphorus.
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