Red, yellow, and green bell peppers are a colorful, delicious source of vitamin C, which is necessary for hair health for many reasons. Besides helping the body use non-heme iron — the type found in plant foods — to ensure that there is enough iron in red blood cells to carry oxygen to hair follicles, vitamin C is also used to form collagen, a structural fiber that helps our bodies (quite literally!) hold everything together. Hair follicles, blood vessels, and skin all require collagen to stay healthy for optimal growth. Even minor vitamin C deficiencies can lead to dry, splitting hair that breaks easily.