Bell peppers are one of the most nutrient-dense vegetables you can eat, packed with vitamin C, protective plant pigments, and fiber while staying extremely low in calories. A single green bell pepper delivers twice the vitamin C of an orange, and a red one delivers three times as much. Beyond that headline number, each color of bell pepper brings a slightly different mix of antioxidants that support everything from eye health to iron absorption.
A Vitamin C Powerhouse
Vitamin C is the standout nutrient in bell peppers, and the amounts are surprisingly high. Green peppers contain 80 milligrams per 100 grams of flesh. Yellow peppers more than double that, hitting 184 milligrams per 100 grams. Red peppers fall somewhere in between but still far exceed most fruits and vegetables people typically think of as vitamin C sources.
That vitamin C does several important things in your body. It’s essential for producing collagen, the structural protein that strengthens your skin, blood vessels, and muscles. It acts as an antioxidant, protecting cells from damage. And it plays a direct role in immune function. Because vitamin C is water-soluble, your body doesn’t store it, so eating bell peppers regularly helps you maintain steady levels.
Each Color Has Different Strengths
Green, yellow, orange, and red bell peppers aren’t different varieties. They’re the same pepper at different stages of ripeness. Green is the unripe stage, and the pepper gradually shifts to yellow, orange, or red as it matures, depending on the cultivar. That ripening process changes the nutritional profile significantly.
Red bell peppers are the most nutrient-dense overall. They’re loaded with beta-carotene (a form of vitamin A) and contain lycopene, the same pigment found in tomatoes. They also contain capsanthin, a red carotenoid that makes up roughly 80% of their total carotenoid content and has been linked to healthier blood lipid levels and improvements in gut bacteria composition. Yellow peppers, by contrast, have almost no beta-carotene but deliver the highest vitamin C levels. Orange peppers are uniquely rich in lutein and zeaxanthin, containing about 10 times the amount found in other colors.
Green peppers still offer solid nutrition, just less of it. They have fewer antioxidants and a slightly more bitter flavor because the sugars haven’t fully developed yet. If you’re buying on a budget, green peppers cost less because they’re harvested earlier, and they still give you a strong dose of vitamin C and fiber.
Eye Protection From Orange Peppers
Orange bell peppers are the richest known food source of zeaxanthin, a pigment that accumulates in the macula at the back of your eye. Zeaxanthin acts as a natural filter against blue light, which can damage photoreceptors over time and contribute to age-related macular degeneration. Research from the Queensland Alliance for Agriculture and Food Innovation found that a single orange bell pepper (roughly 450 grams) contains zeaxanthin equivalent to 30 supplement tablets. Just 10 grams of orange pepper flesh delivers about the same amount as one zeaxanthin supplement capsule, with 2 milligrams being the recommended daily dose.
Macular degeneration affects about one in seven people over 50 and one in three over 80, making it a leading cause of vision loss. Regularly eating orange bell peppers is one of the simplest dietary strategies for building up the protective pigment layer in your eyes. Green peppers also contain lutein and zeaxanthin, though in smaller amounts.
Better Iron Absorption From Plant Foods
If you eat a mostly plant-based diet, bell peppers can help solve one of its trickiest nutritional challenges: getting enough iron. Your body absorbs iron from plant sources (non-heme iron) much less efficiently than iron from meat. Vitamin C significantly increases that absorption rate. Pairing a bell pepper with iron-rich plant foods like lentils, spinach, beans, or fortified grains helps your body pull more iron from those foods.
This is especially useful for vegetarians, vegans, and anyone prone to iron deficiency. Toss sliced red pepper into a bean salad, add green pepper to a lentil stew, or eat raw pepper strips alongside hummus. The vitamin C needs to be consumed at the same meal as the iron source to have this effect.
Antioxidants Beyond Vitamins
Bell peppers contain more than 30 identified carotenoid pigments along with a range of flavonoids, which are plant compounds that help protect cells from oxidative stress. The two most prevalent flavonoids in peppers are quercetin and luteolin, both of which belong to classes of compounds widely studied for their protective effects throughout the body.
In red peppers specifically, capsanthin dominates the carotenoid profile at about 32% of total carotenoids, followed by beta-carotene at 12% and capsorubin at roughly 8%. These aren’t just responsible for the pepper’s color. They function as antioxidants once you eat them, helping neutralize free radicals that can damage cells over time. The antioxidant profile shifts as the pepper ripens, so eating a variety of colors gives you the broadest range of protective compounds.
Fiber With Very Few Calories
A cup of chopped red bell pepper provides about 3.1 grams of fiber, while a cup of green pepper gives you 2.5 grams. That fiber supports digestive health and helps you feel full, which is notable given that a whole medium bell pepper contains only about 30 to 40 calories. The carbohydrate content is modest, and much of it comes from natural sugars that develop as the pepper ripens, which is why red and yellow peppers taste sweeter than green ones.
Simple Ways to Get More Bell Peppers
Raw bell peppers retain the most vitamin C, since heat breaks down some of it during cooking. Slicing them into strips for snacking or adding them to salads is the easiest way to preserve their full nutrient content. That said, cooking peppers with a small amount of fat (like olive oil in a stir-fry) actually improves your absorption of their fat-soluble carotenoids, including beta-carotene and capsanthin.
A practical approach is to eat them both ways. Use raw peppers when you want maximum vitamin C, and cook them when they’re part of a dish where the carotenoids matter more. Roasting concentrates their sweetness and makes red and yellow peppers especially versatile as a side dish, sandwich topping, or pasta ingredient. Frozen bell peppers retain most of their nutrients and work well in cooked dishes when fresh ones aren’t available or affordable.