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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.
The common cold is typically a result of lowered levels of vitamin C in your body. Try eating grapes to supplement your body with vitamin C. 2. Vitamin B1. If you're looking to get an energy boost, grapes help you by providing your body with vitamin B1. Vitamin B1 is a vitamin that will give your body energy. Aside from doing that, it will also help keep your nervous system to function properly.