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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.
Grapes are rich source of micronutrient minerals like copper, iron and manganese. Copper and manganese are an essential co-factor of antioxidant enzyme, superoxide dismutase.Iron is especially concentrated in raisins.In addition, 100 g of fresh grapes contain about 191 mg of health benefiting electrolyte, potassium.atechins, a type of flavonoid tannin group of anti-oxidants, found in the white/green varieties have also shown to possess these health-protective functions. 1  In addition, the berries are very low in calories. 2  100 g fresh grapes just provide 69 calories but zero cholesterol levels.