Bell peppers deliver a surprisingly powerful nutritional punch, starting with vitamin C: a single cup of chopped raw red bell pepper contains 191 milligrams, which is 212% of your daily value. That’s more than twice what you’d get from an orange. Beyond that headline number, bell peppers supply a range of antioxidants, carotenoids, and other compounds that support everything from your skin and eyes to your immune system and iron absorption.
A Vitamin C Powerhouse for Immunity
Vitamin C is essential for a functioning immune system. It helps your body produce white blood cells and strengthens the barriers that keep pathogens out. Because your body can’t store vitamin C or make it on its own, you need a steady daily supply from food. One cup of chopped red bell pepper covers more than two full days’ worth, making it one of the most concentrated food sources available.
Green bell peppers are no slouch either, providing about 120 milligrams per cup. But red peppers contain roughly twice as much vitamin C as green ones, because they’ve spent more time ripening on the plant and accumulating nutrients.
How Color Changes the Nutrition
Green, yellow, orange, and red bell peppers are all the same species picked at different stages of ripeness. Green peppers are harvested earliest, while red peppers have fully matured. That extra time on the vine makes a significant difference. Red bell peppers have almost 11 times more beta-carotene than green ones, along with the doubled vitamin C mentioned above. Yellow and orange peppers fall somewhere in between.
The color shift also reflects a change in the types of antioxidants present. Unripe green peppers are rich in lutein, beta-carotene, and a compound called violaxanthin. As the fruit ripens to red, a carotenoid called capsanthin becomes dominant, making up roughly 80% of the total carotenoids in red bell peppers. More than 30 different carotenoid pigments have been identified in pepper fruit overall. So eating a variety of colors gives you a broader spectrum of protective compounds.
Antioxidants That Go Beyond Vitamin C
Bell peppers are loaded with carotenoids, which act as powerful antioxidants in your body. In red peppers, capsanthin is the star. Research links it to improvements in blood lipid profiles and positive changes in gut bacteria. While capsanthin doesn’t convert to vitamin A the way beta-carotene does, it’s an effective antioxidant on its own.
Other notable carotenoids in bell peppers include beta-carotene (which your body does convert to vitamin A), lutein, zeaxanthin, and beta-cryptoxanthin. Together, these compounds help neutralize free radicals, the unstable molecules that damage cells and contribute to chronic disease over time. The practical takeaway: bell peppers give you antioxidant protection through multiple pathways, not just one.
Skin Protection From the Inside Out
The combination of vitamin C and carotenoids in bell peppers has real benefits for your skin. Vitamin C is a building block for collagen, the protein that keeps skin firm and elastic. But the carotenoids play a distinct protective role against sun damage.
Research in animal models has shown that compounds from sweet peppers can counteract the effects of UV radiation on skin. UV exposure normally breaks down collagen fibers and ramps up the enzymes that degrade your skin’s structural support. In studies using hairless mice (a standard model for skin research), daily consumption of sweet pepper juice reversed these effects: it boosted collagen production, suppressed the enzymes that break collagen down, and restored overall collagen levels in UV-exposed skin. The peppers also reduced inflammation and DNA damage from UV exposure while strengthening the skin’s own antioxidant defenses.
Clinical studies in human volunteers have found that sweet pepper compounds inhibited UV-induced skin damage and improved facial skin moisture. This doesn’t mean bell peppers replace sunscreen, but regularly eating them contributes to your skin’s resilience against everyday sun exposure and aging.
Better Iron Absorption
If you eat a plant-based diet or struggle with low iron levels, bell peppers can help in a way most people don’t expect. Plant foods contain a form of iron called non-heme iron, which your body absorbs poorly compared to the iron in meat. Vitamin C dramatically improves this absorption by binding to the iron and keeping it in a form your gut can actually take up, even as it moves through the more alkaline parts of your small intestine where iron typically becomes insoluble.
This means pairing bell peppers with iron-rich plant foods like spinach, lentils, or beans at the same meal can meaningfully increase how much iron you actually absorb. It’s one of the simplest dietary strategies for preventing iron-deficiency anemia, and bell peppers are arguably the easiest way to get a large dose of vitamin C into a savory meal.
Eye Health Support
Bell peppers contain lutein and zeaxanthin, two carotenoids that concentrate in the macula, the part of your retina responsible for sharp central vision. These pigments act as a natural blue-light filter and protect the delicate cells in your eyes from oxidative stress. Higher dietary intake of lutein and zeaxanthin is associated with lower risk of age-related macular degeneration, the leading cause of vision loss in older adults.
Green and orange peppers tend to have higher concentrations of lutein specifically, while red peppers contribute zeaxanthin along with their dominant capsanthin. Eating peppers of different colors over time helps cover both compounds.
Low Calorie, High Volume
Bell peppers are mostly water, making them a low-calorie food that still feels substantial on a plate. A full cup of chopped raw red pepper has only about 39 calories. That high water content, combined with dietary fiber, helps you feel full without adding many calories to your meal. For anyone managing their weight, bell peppers are one of the most nutrient-dense foods you can eat relative to their calorie cost. You get significant amounts of vitamin C, vitamin A (from beta-carotene), and several B vitamins while barely moving the needle on your daily calorie intake.
They’re also versatile enough to eat raw with hummus, roasted as a side dish, stuffed as an entrée, or sliced into stir-fries, which makes it easy to eat them consistently rather than as an occasional novelty.