Lycopene is a powerful antioxidant. It's found in abundance in some fruits and vegetables, particularly cooked tomatoes. Some studies show that people who eat diets high in tomatoes and other fruits high in lycopene have lower cancer rates, and some researchers even believe lycopene may retard the growth of prostate tumors. However, results of several studies have not been consistent.
Lycopene is found in large quantities in foods normally consumed. No side effects have been noted or precautions suggested when this "super nutrient" is eaten as part of a balanced diet.