One important job is to scavenge free radicals. It also seems to help slow the progression of plaque that is already formed. There are hundreds of carotenoids and it seems likely that some may be as important as, if not more important than, beta-carotene. In fact, new research shows it's quite likely that health benefits are due to many carotenoids working together to produce antioxidant protection. Lycopene, for instance, is a powerful carotenoid that may protect against heart disease.
Tomatoes are rich in lycopene, but have little beta-carotene.
Other carotenoids found in green leafy vegetables are being studied for protective effects against eye disease. Phytochemicals Phytochemicals are compounds found in vegetables and fruits. Antioxidant phytochemicals include the many types of flavenoids. It may inhibit types of cancer and slow the aging process. Researchers think that getting enough cruciferous vegetables like Brussels sprouts, kale, cabbage, and broccoli, may raise glutathione levels in the body.