Want to color your life healthy? Brightly colored bell peppers, whether green, red, orange or yellow, are rich sources of some of the best nutrients available. To start, peppers are excellent sources of vitamin C and vitamin A (through its concentration of carotenoids such as beta-carotene), two very powerful antioxidants. These antioxidants work together to effectively neutralize free radicals, which can travel through the body causing huge amounts of damage to cells.