free-radical damage and lower your risk of heart disease by preventing blood clots and reducing inflammation. The resveratrol in green seedless grapes may also prevent the growth of cancer cells. Green seedless grapes can help you meet your vitamins A, C and K needs. One cup of grapes provides 100 international units of vitamin A, 4.8 milligrams of vitamin C and 22 micro grams of vitamin K. Vitamin A helps your body fight off infection by boosting your immune system. Vitamin C is important for healthy gums and muscles and also helps wounds to heal. And finally, vitamin K is essential for blood clotting.