Calories: 46 Carbs: 11.5 grams Fiber: 0.6 grams Sugar: 9.4 grams Protein: 0.9 grams Fat: 0.2 grams Vitamin A: 5% of the Daily Value (DV) Vitamin C: 14% of the DV Potassium: 4% of the DV Magnesium: 4% of the DV Watermelon is also a rich source of citrulline, an amino acid that may improveTrusted Source exercise performance. Plus, it boasts antioxidants, including vitamin C, carotenoids, lycopene, and cucurbitacin E, all of which are beneficialTrusted Source for your health in watermelon as well as other food sources. These compounds help combatTrusted Source free radicals, which are unstable molecules that may damage your cells if they accumulate in your body. Over time, this damage may lead to conditions like diabetes, heart disease, and cancer.