Phytochemicals are plant-based chemical compounds. Phytochemicals are basically the "nice to have" nutrients - they are helpful to health, but not essential for life. There are over 1,000 known phytochemicals. Some of the best-known phytochemicals include resveratrol, beta-carotene and lycopene.
How much you should have: A diet rich in phytochemicals should be eaten, preferably from food, not supplements. Organic and naturally-raised foods have more phytochemicals than heavily processed foods.