Contain concentrated levels of carotenoid phytonutrients which provide powerful antioxidant protection. Since the color of the pepper is associated with the levels of this antioxidant, you can visually evaluate the health benefits from each. Yellow peppers are high in lutein and zeaxanthin, which are great for vision health. Orange peppers contain alpha- and gamma-carotene, help convert vitamin A for a healthy immune system. Red sweet peppers are filled with carotenoid phytonutrients, and contain almost 11 times more beta-carotene than green peppers, as well as one and a half times the vitamin C, which helps prevent cell damage and a variety of diseases.