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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 continue to ripen after they have been harvested. Refrigerating them slows the ripening process down. Fresh grapes have a green stem, while older grapes have dried out and brown stems. Grapes can also be frozen to extend their shelf life. One cup of grapes has 104 calories. They contain high levels of vitamin C and vitamin K. They are low in saturated fat, sodium and cholesterol. Grapes are primarily composed of carbohydrates and have high levels of sugar.