... carotene, it has no vitamin A activity.Lycopene is the most powerful carotenoid quencher of singlet oxygen, being 100 times more ... efficient in the singlet-oxygen quenching action than Vitamin E, which in turn has 125 times the quenching action ... disease, cancer, diabetes, osteoporosis, and even male infertility.The most recent study, however, has cast significant doubt on these benefits ...