Most vitamins are easy to get from everyday foods if you know where to look. A single baked sweet potato delivers more vitamin A than you need in a day, half a cup of raw red bell pepper covers your entire vitamin C requirement, and a one-ounce handful of sunflower seeds provides nearly half your daily vitamin E. Below is a vitamin-by-vitamin breakdown of the richest food sources, how much they contain, and what to keep in mind when preparing them.
Vitamin A: Orange Vegetables and Liver
Adults need 700 to 900 micrograms (mcg) of vitamin A per day, depending on sex. Animal foods supply it in a ready-to-use form, while plants provide a precursor your body converts as needed.
Among animal sources, beef liver is in a class of its own: a 3-ounce pan-fried serving contains 6,582 mcg, which is more than seven times the daily target. Most people don’t eat liver regularly, though. More common options include fortified skim milk (149 mcg per cup) and part-skim ricotta cheese (133 mcg per half cup).
On the plant side, the standouts are deeply pigmented vegetables and fruits. One whole baked sweet potato delivers 1,403 mcg. Half a cup of frozen spinach (boiled) provides 573 mcg, and half a cup of raw carrots gives you 459 mcg. Cantaloupe and red bell peppers round out the list at 135 and 117 mcg per half cup, respectively. These plant sources carry virtually no risk of overdose because your body regulates how much of the precursor it converts. Preformed vitamin A from animal foods or supplements, on the other hand, has a tolerable upper limit of 3,000 mcg per day for adults.
B Vitamins: Whole Grains, Meat, and Legumes
The eight B vitamins work together in energy metabolism, nerve function, and cell production. Rather than one standout food, they tend to cluster in a few food groups.
- B1 (thiamin), 1.1–1.2 mg/day: Pork, whole grains, black beans, and fortified cereals. Thiamin is especially sensitive to heat, with retention dropping as low as 20% in some cooking methods.
- B2 (riboflavin), 1.1–1.3 mg/day: Milk, eggs, lean meats, and mushrooms.
- B3 (niacin), 14–16 mg/day: Chicken breast, tuna, peanuts, and lentils. Niacin is one of the most heat-stable B vitamins, retaining 63–95% through cooking.
- B6, 1.3–1.7 mg/day: Chickpeas, potatoes, salmon, and bananas.
- Folate (B9), 400 mcg/day: Dark leafy greens, lentils, asparagus, and fortified grains. Folate leaches readily into cooking water, with only about 40% retained after boiling.
- B12, 2.4 mcg/day: Found almost exclusively in animal products: clams, beef, trout, milk, and fortified nutritional yeast. This is the one B vitamin that people on fully plant-based diets need to supplement or get from fortified foods.
Vitamin C: Peppers, Citrus, and Kiwi
Women need 75 mg of vitamin C per day, men need 90 mg, and smokers should add another 35 mg on top of that. The richest food sources are not oranges, as many people assume, but bell peppers. Half a cup of raw red bell pepper delivers 95 mg, which already exceeds the daily target for both sexes. Three-quarters of a cup of orange juice comes close at 93 mg. A medium orange provides 70 mg, a medium kiwi has 64 mg, and half a cup of raw green bell pepper adds 60 mg.
Vitamin C is the most fragile of all vitamins during cooking. It breaks down quickly with heat and dissolves into water. Eating fruits and vegetables raw preserves the most, but if you prefer them cooked, steaming or microwaving retains significantly more vitamin C than boiling does.
Vitamin D: Fatty Fish, Eggs, and Sunlight
The recommended intake for vitamin D is 600 IU per day for adults up to age 70, rising to 800 IU after that. It is one of the hardest vitamins to get from food alone. Fatty fish are the best dietary source: a 3-ounce serving of trout or salmon typically provides 400–600 IU. A cup of fortified milk or plant milk adds about 100–120 IU, and a large egg yolk contributes around 40 IU. UV-exposed mushrooms have become another option, with some varieties providing meaningful amounts after being treated with light.
Because few foods are naturally rich in vitamin D, many people rely on a combination of fortified foods and sun exposure. Your skin produces vitamin D when exposed to UVB rays, but latitude, season, skin tone, and sunscreen use all affect how much you actually make. The tolerable upper limit is 4,000 IU per day for adults, which is relevant mainly for people taking high-dose supplements.
Vitamin E: Nuts, Seeds, and Plant Oils
The daily target for vitamin E is 15 mg for all adults. Nuts and seeds are by far the best sources. One ounce of dry-roasted sunflower seeds contains 7.4 mg, nearly half a day’s worth. An ounce of dry-roasted almonds provides 6.8 mg, and hazelnuts deliver 4.3 mg per ounce. Even two tablespoons of peanut butter contribute 2.9 mg.
Plant oils are another concentrated source. Sunflower oil, safflower oil, and wheat germ oil all provide substantial vitamin E per tablespoon. The practical upside of vitamin E food sources is that they’re hard to overdo. The upper limit of 1,000 mg per day applies only to supplements, not food, and you’d need to eat an improbable amount of almonds to approach it.
Vitamin K: Leafy Greens and Fermented Foods
Women need about 90 mcg of vitamin K per day, men need 120 mcg, and dark leafy greens blow past those numbers easily. Half a cup of boiled collard greens provides 530 mcg. The same amount of turnip greens delivers 426 mcg. Even a cup of raw spinach (145 mcg) or raw kale (113 mcg) more than covers the daily target. At the other end of the spectrum, a cup of iceberg lettuce provides just 14 mcg, so not all salads are created equal.
There are two forms of vitamin K. The K1 form, found in green vegetables, handles blood clotting. K2, found in fermented and animal foods, plays a role in bone and cardiovascular health. The richest K2 source by a wide margin is natto, a Japanese fermented soybean product, which contains about 850 mcg per 3-ounce serving. Other fermented foods and organ meats contain much smaller amounts. Braised chicken liver, for instance, has only about 6 mcg of K2 per serving. No upper limit has been established for vitamin K because of limited data, but food-based intake is not considered risky.
How Cooking Affects Vitamin Content
Not all vitamins survive the trip from your cutting board to your plate equally. Water-soluble vitamins (C and the B group) are the most vulnerable. Boiling is the harshest method because vitamins leach directly into the water, which most people pour down the drain. Vitamin C and folate take the biggest hits. Retinol (the animal form of vitamin A) also drops significantly during boiling, retaining as little as 33% in some vegetables.
Microwave cooking consistently preserves the most vitamins across studies, likely because it uses less water and shorter cooking times. Steaming is the next best option. If you do boil vegetables, using the cooking liquid in soups or sauces recaptures some of the lost nutrients. Fat-soluble vitamins (A, D, E, K) are generally more stable during cooking, though prolonged high heat still degrades them. Niacin stands out as particularly resilient, holding up well regardless of method.
Getting the Full Spectrum From Food
A few practical patterns cover most of your bases. Eating a variety of colorful vegetables handles vitamins A, C, K, and folate. Including nuts or seeds daily takes care of vitamin E. Fatty fish twice a week contributes vitamin D, B12, and niacin. Whole grains and legumes fill in the remaining B vitamins. The only nutrient that consistently falls short in food-only diets is vitamin D, especially for people living in northern latitudes or spending most of their time indoors.
One thing worth noting: fat-soluble vitamins (A, D, E, K) absorb better when eaten with some dietary fat. A drizzle of olive oil on your spinach salad or a handful of nuts alongside your carrots actually makes a measurable difference in how much of those vitamins your body takes up. Water-soluble vitamins don’t have this requirement, but they also can’t be stored for long, which means you need a steady daily supply rather than occasional large doses.