Capsicums of all types contain good amounts of vitamin C.
Red capsicums contain lutein and zeaxanthin, carotenoids that may lower the risk of age-related blindness due to macular degeneration and cataracts, as well as forms of cancer.
Chillies contain concentrated amounts of capsaicin which is used topically to treat pain and can help to inhibit cholesterol formation.
Chlorophyll in capsicums may protect against environmental carcinogens.