Grapes contain a modest but broad range of vitamins, including vitamin C, vitamin K, several B vitamins, and small amounts of vitamins A and E. They’re not a powerhouse source of any single vitamin, but they contribute useful amounts across many, especially when eaten as part of a fruit-rich diet.
Vitamin C
A one-cup serving of grapes (about 92 grams) provides roughly 4 mg of vitamin C. That’s only about 4 to 5 percent of the daily recommended intake, so grapes won’t replace citrus fruits or bell peppers as your go-to source. Red and green grapes are nearly identical here, both delivering about 3 mg per 100 grams. Still, vitamin C supports immune function and helps your body absorb iron from plant foods, so every bit adds up across a day’s worth of eating.
Vitamin K
Vitamin K is one of the more notable vitamins in grapes. A cup of raw American-type grapes contains about 13.4 micrograms, while canned Thompson seedless grapes have roughly 24 micrograms per cup. The daily recommended intake for adults is 90 to 120 micrograms, so a cup of fresh grapes covers around 11 to 15 percent of what you need. Vitamin K plays a central role in blood clotting and helps direct calcium into your bones rather than your arteries.
B Vitamins
Grapes carry a range of B vitamins in small quantities. Per ounce of fresh grapes, you’ll get traces of thiamin (B1), riboflavin (B2), niacin (B3), vitamin B6, and folate (B9). None of these amounts are large on their own. A cup of grapes isn’t going to meaningfully change your B vitamin status. But B vitamins work as a team to help convert food into energy, support nervous system function, and assist in making red blood cells, so the collective contribution from grapes adds to what you get from grains, meats, and legumes throughout the day.
Grapes also contain choline, a nutrient sometimes grouped with B vitamins. Fresh grapes provide about 1.6 mg per ounce. That’s a fraction of the 425 to 550 mg adults need daily, but choline supports brain function and liver health, and most people don’t get enough of it.
Vitamins A and E
Fresh grapes contain very small amounts of both vitamin A and vitamin E. A one-ounce serving has about 1.4 micrograms of vitamin A (as RAE) and 0.05 mg of vitamin E. These are trace quantities, well under 1 percent of daily needs. Grapes also supply lutein and zeaxanthin, two pigments related to vitamin A that support eye health. A cup of raw American-type grapes provides about 66 micrograms of these combined compounds. That’s far less than what you’d get from spinach or kale, but it’s a small bonus if you’re snacking on grapes regularly.
Red vs. Green Grapes
When it comes strictly to vitamins, red and green grapes are nearly interchangeable. Both contain about 3 mg of vitamin C per 100 grams and similar levels of B vitamins and vitamin K. The real difference between the two is in their antioxidant content, not their vitamin profiles. Red and black grapes get their deeper color from plant pigments that act as antioxidants, but these compounds aren’t classified as vitamins. If your main concern is getting more vitamins from grapes, color doesn’t matter much. Pick whichever variety you enjoy eating more of.
How Drying and Juicing Affect Vitamins
Turning grapes into raisins concentrates some vitamins while destroying others. Ounce for ounce, raisins contain roughly double the niacin (B3), more riboflavin (B2), more vitamin B6, and twice the choline of fresh grapes. The drying process packs more grape material into less weight, so these water-stable nutrients become more concentrated. Thiamin (B1) stays about the same.
On the other hand, raisins lose a significant share of their vitamin C, vitamin K, vitamin A, and vitamin E compared to fresh grapes. Vitamin K drops by about 75 percent ounce for ounce, and vitamin C falls by roughly 40 percent. Heat and air exposure during drying break down these more fragile nutrients. If you’re eating raisins for convenience, you’re trading some vitamins for others.
Grape juice tells a similar story. Pasteurization, the heat treatment used to make juice shelf-stable, degrades vitamin C over time. The longer juice is heated, the more vitamin C is lost. Fresh-squeezed grape juice retains more than store-bought versions, but commercial grape juice still loses a measurable portion of its original vitamin C during processing. Vitamin K and fat-soluble vitamins also tend to be lower in juice since some are bound to the skin and pulp that get filtered out.
Getting the Most Vitamins From Grapes
Eating grapes fresh and whole gives you the fullest vitamin profile. The skin contains vitamin K and other nutrients that are partially lost in juicing. Keeping grapes refrigerated and eating them within a week of purchase also helps preserve vitamin C, which degrades with time and light exposure.
Pairing grapes with foods that are higher in the vitamins grapes lack makes the most nutritional sense. A handful of grapes alongside nuts (rich in vitamin E) or cheese (rich in B12 and vitamin A) creates a snack that covers more ground than grapes alone. Grapes work best as one piece of a varied diet rather than a vitamin supplement in fruit form.