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Grapes are a source of vitamins, with each cup providing 13.4 micrograms of vitamin K, or 17 percent of the daily value; 3.7 milligrams of vitamin C and 0.09 milligrams of thiamine, or six percent of the daily value for each of the latter two nutrients; and 0.1 milligrams of vitamin B-6, or five percent of the DV.hile red seedless grapes aren't a great source of minerals, they do provide 176 milligrams of potassium, or five percent of the DV, per one-cup serving, as well as smaller amounts of magnesium, zinc, iron, calcium and phosphorus.
Another class of antioxidant polyphenols in grapes are called flavonols. Grapes contain the flavonols quercetin, also in apples, and kaempferol, also in broccoli, which are thought to reduce cellular proliferation and cancer.ince most of the antioxidants are found in the seed and skin of the grape â 80% unless the flesh is darker and has more antioxidants, a juiceâs or wineâs antioxidant content will be higher if it includes the seeds and skin. This is why red wine contains eight to ten times the polyphenol content as white wine.