Prebiotics also boost mineral absorption, improve blood glucose and insulin levels, and may protect against colon cancer. It Helps Defend Against Disease Watermelon is one of the best sources of lycopene, according to a 2014 study in Experimental and Clinical Sciences. That natural sweetness is bundled with vitamins A and C, which support immune function and skin health, and potassium, magnesium, B vitamins, and health-protective antioxidants. It Helps Lower Blood Pressure and Improves Circulation L-citrulline, a natural substance in watermelon (particularly in the white part of the rind), has been shown to improve artery function and lower blood pressure by helping blood vessels relax and improving circulation. A 2017 study in Clinical Nutrition and Metabolic Care also shows that L-citrulline may improve muscle oxygenation and athletic performance during endurance exercise. It Reduces Muscle Soreness In a 2014 study in the Journal of Agricultural and Food Chemistry, athletes who...