Corn is a solid source of several B vitamins, vitamin C, and vitamin E, with yellow varieties also providing meaningful amounts of vitamin A and eye-protective carotenoids. The exact vitamin profile shifts depending on the color of the corn and how it’s prepared, but even a single cup of cooked sweet corn delivers a surprisingly broad range of micronutrients.
B Vitamins: Corn’s Strongest Suit
The B vitamin family is where corn really shines. One cup of cooked yellow sweet corn provides 0.35 mg of thiamin (B1), which covers roughly a quarter of most adults’ daily needs. Thiamin helps your body convert carbohydrates into usable energy, and grain-based foods like corn are one of the most common dietary sources.
That same cup also delivers 75 mcg of folate (B9), about 19% of the daily recommendation. Folate plays a central role in cell division and DNA synthesis, making it especially important during pregnancy. Corn also contains 0.1 mg of vitamin B6, which supports immune function and helps your body process protein.
Corn does contain niacin (B3), but there’s a catch. In raw or conventionally cooked corn, much of the niacin is chemically bound in a form your body can’t absorb well. This is why populations that historically relied on corn as a staple grain sometimes developed pellagra, a niacin deficiency disease. The ancient technique of nixtamalization, boiling corn kernels in water with calcium hydroxide (lime), breaks those bonds and makes the niacin far more accessible. This is the process behind tortillas, hominy, and masa. If you eat corn primarily as fresh sweet corn or cornbread, you’re getting less usable niacin than you would from nixtamalized products like tortillas.
Vitamin C
A cup of boiled sweet corn provides about 10 mg of vitamin C, roughly 11% of the daily value. That’s modest compared to citrus fruits or bell peppers, but it’s notable for a starchy grain. Vitamin C degrades with heat and cooking time, so fresher preparations and shorter cook times preserve more of it. Canned corn, which has been heat-processed, retains less.
Vitamin E
Corn kernels contain vitamin E in the form of both tocopherols and tocotrienols, which act as fat-soluble antioxidants. Most of the vitamin E is concentrated in the germ, the small fatty core of each kernel. Sweet corn varieties vary in how much vitamin E they contain. Breeding research has produced cultivars with up to 4.5 times higher levels of the most active forms of vitamin E compared to standard varieties, though what you find at the grocery store will typically be a conventional type.
Yellow vs. White Corn: A Major Vitamin A Gap
This is one of the biggest nutritional differences between corn varieties, and most people don’t know about it. Yellow sweet corn contains 271 IU of vitamin A per 100 grams, thanks to its beta-carotene content (68 mcg per 100g). White sweet corn contains virtually none: just 1 IU of vitamin A and 1 mcg of beta-carotene per 100g.
The yellow and orange pigments in corn are literally the vitamin A precursors. White corn lacks those pigments, so it lacks the vitamin. If you’re choosing between the two and want more nutritional value per bite, yellow corn wins on this front. The B vitamins and vitamin C are comparable between the two colors.
Lutein and Zeaxanthin: Protection for Your Eyes
Yellow corn is one of the richest common food sources of lutein and zeaxanthin, two carotenoids that accumulate in the retina and help protect against age-related macular degeneration. These aren’t technically vitamins, but they’re closely related to vitamin A and are often the reason nutritionists recommend yellow and orange vegetables.
The concentrations vary across the kernel. Corn oil extracted from ground kernels can contain up to 220 mcg/g of combined lutein and zeaxanthin. Research from the USDA has shown that roughly two tablespoons per day of certain corn oils could provide about 6 mg of these carotenoids, which is the daily amount currently considered helpful for slowing macular degeneration progression. Eating whole corn kernels provides these compounds too, though in lower concentrations than extracted oil. Again, white corn offers almost none of these pigment-based compounds.
How Cooking and Processing Affect Corn’s Vitamins
Fresh corn on the cob that’s briefly boiled or grilled retains the most vitamins overall. Longer cooking times and higher water volumes leach out water-soluble vitamins like vitamin C, thiamin, and folate. Canned corn loses some of these during processing but still provides reasonable amounts of B vitamins.
Nixtamalized corn products like tortillas and tamales trade some vitamin C for dramatically better niacin absorption and added calcium from the lime treatment. Popcorn, being a dried whole grain, retains its B vitamins and vitamin E well but has little vitamin C. Corn flour and cornmeal in the U.S. are often enriched with added thiamin, niacin, riboflavin, folic acid, and iron, so processed corn products like cornbread or cereal may actually deliver higher vitamin levels than plain cooked kernels, though those are added rather than naturally present.