Fruits and vegetables are the best sources of vitamin C, and many common ones deliver your entire daily requirement in a single serving. Adults need 75 to 90 mg per day, and foods like bell peppers, citrus fruits, broccoli, strawberries, and kiwi all pack enough to hit that target with ease.
How Much You Actually Need
The recommended daily intake is 90 mg for adult men and 75 mg for adult women. If you smoke, add another 35 mg per day to that number, because smoking depletes vitamin C faster. These amounts are surprisingly easy to get from food. A single medium orange contains roughly 70 mg, and a cup of raw red bell pepper delivers well over 100 mg.
The Best Fruit Sources
Citrus fruits are the classic answer, and they earn the reputation. Oranges, grapefruits, lemons, and limes are all reliable sources, with oranges leading the pack at about 70 mg per medium fruit. But several other fruits outperform citrus by a wide margin.
Kiwifruit contains roughly 70 mg per fruit despite its small size, making it one of the most concentrated common sources. Strawberries deliver around 85 mg per cup. Papayas, mangoes, and pineapples are solid tropical options. Acerola cherries are among the richest known sources of vitamin C in nature, though they’re harder to find fresh in most grocery stores. A single cup of strawberries or a couple of kiwis will cover your daily needs entirely.
The Best Vegetable Sources
Bell peppers are the standout here. Red bell peppers contain more vitamin C than almost any common fruit or vegetable, with a single medium pepper delivering roughly 150 mg. Green bell peppers have less but still provide a significant amount. Broccoli, Brussels sprouts, cauliflower, and cabbage are all strong sources from the cruciferous family. Tomatoes, potatoes, and leafy greens like spinach and kale contribute meaningful amounts too.
One advantage of vegetables is that many of them show up in meals you’re already eating. A stir-fry with bell peppers or a side of steamed broccoli adds vitamin C without requiring you to think about it as a health decision.
How Cooking Affects Vitamin C
Vitamin C is sensitive to heat, water, and air, which means cooking reduces the amount you actually get. The losses vary dramatically depending on the method. Steaming causes the least damage, with losses ranging from about 5% to 92% depending on the vegetable and cooking time. Boiling is similar in range (6% to 93%) but tends to leach more vitamin C into the water, which you typically discard. Frying causes the highest losses, between 33% and 95%.
The practical takeaway: eat some of your vitamin C sources raw when you can. Raw bell pepper strips, fresh fruit, and salads preserve the full amount. When you do cook, steaming for a shorter time retains more than boiling for a long time. If you’re making soup, the vitamin C that leaches into the broth stays in the dish, so you still benefit.
Food Sources vs. Supplements
Natural and synthetic vitamin C are chemically identical, and your body absorbs them the same way. Multiple studies in humans have found no clinically significant difference in blood levels of vitamin C whether people consumed it from orange juice, orange slices, cooked broccoli, or a synthetic tablet. One study even found that synthetic vitamin C dissolved in water was absorbed slightly better than orange juice.
There’s a popular belief that the plant compounds found alongside vitamin C in whole foods (often called bioflavonoids) improve absorption. The research doesn’t strongly support this. Out of ten clinical studies comparing vitamin C alone versus vitamin C with naturally occurring plant compounds, most found no appreciable difference in absorption. Only one small study of eight people found meaningfully better absorption from a citrus extract containing those compounds.
That said, whole foods offer fiber, potassium, folate, and hundreds of other beneficial compounds that a pill doesn’t. The vitamin C itself absorbs equally well either way, but a bell pepper gives you more than just vitamin C.
What Vitamin C Does in Your Body
Vitamin C plays a central role in building collagen, the protein that holds together your skin, tendons, blood vessels, and bones. It stabilizes collagen at the molecular level, making the protein strong enough to support tissue structure. It also increases collagen production by boosting the activity of the cells responsible for making it, a capacity that naturally declines with age. This is why poor wound healing is one of the hallmark signs of deficiency.
Beyond collagen, vitamin C functions as an antioxidant, neutralizing unstable molecules that damage cells. It supports immune cell function and helps protect skin from UV damage. Combined with vitamin E, it’s been shown to reduce the immune-suppressing effects of sun exposure.
Signs You’re Not Getting Enough
Severe vitamin C deficiency, known as scurvy, is rare in developed countries but still occurs in people with very limited diets. Early signs include fatigue, easy bruising, and slow wound healing. As deficiency worsens, symptoms become more distinctive: bleeding gums, loose teeth, joint pain and swelling, small red or purple spots on the skin (especially around hair follicles on the legs), and coiled or corkscrew-shaped body hairs.
These symptoms all trace back to weakened collagen. Blood vessels become fragile and leak, gums lose structural support, and joints deteriorate. People at higher risk include smokers, those with very restrictive diets, individuals with certain digestive conditions that reduce absorption, and older adults with limited food variety. Even mild, subclinical deficiency can slow healing and increase bruising before full scurvy develops.
Can You Get Too Much?
Vitamin C from food alone is very unlikely to cause problems. Your body absorbs less as intake increases and excretes the excess through urine. High-dose supplements (typically above 1,000 mg per day) can cause nausea, diarrhea, and stomach cramps. Very high long-term intake has been associated with an increased risk of kidney stones in some people, particularly men. For most adults, sticking to food sources makes overconsumption a non-issue.