As an excellent source of antioxidants including vitamin C, watermelon can help combat the formation of free radicals known to cause cancer. Lycopene intake has been linked with a decreased risk of prostrate cancer in several studies. Watermelon also contains citruline, an amino acid that may increase nitric oxide helps your blood vessels expand, which lowers blood pressure. Other vitamins and minerals in watermelon are also good for your heart. Watermelon is effective in reducing both your body temperature and blood pressure. The high amounts of water in watermelon also stimulate a release of excess liquid in the form of sweat, which cools your body further during hot summer days. Watermelon cures impotence. Arginine, present in watermelon, is beneficial in curing erectile dysfunction, and the stimulating nature of the chemical can boost the libido, reduced frigidity, and give your love life a fresh start after you enjoy a few slices of watermelon together.