Lycopene is a naturally occurring chemical that gives fruits and vegetables a red color. It is one of a number of pigments called carotenoids. Lycopene is found in tomatoes, watermelons, red oranges, pink grapefruits, apricots, rosehips, and guavas. In North America, 85% of dietary lycopene comes from tomato products such as ketchup, tomato juice, sauce, or paste. A serving of fresh tomatoes contains between 4 mg and 10 mg of lycopene, while one cup (240 mL) of tomato juice provides about 20 mg.