Found in a variety of fruits and vegetables, Beta-Carotene is famous for giving carrots a rich orange color. This provitamin A is part of the Carotenoid family and readily converts to Vitamin A in the system when needed. Beta Carotene is also an immune system enhancer and antioxidant. Antioxidants help fight cell damaging free radicals in the body. Free radicals can lead to oxidative stress, which studies show, contributes to aging.