The problems of arterial clogging, high blood pressure can be solved only with an inclusion of watermelon it the diet. Watermelons have very significant effect on the circulatory system, as it helps in keeping the arteries in good condition and maintain the blood pressure. The amino acid, L-citrulline, which is found in watermelons, helps in lowering the blood levels. These amino acids also stimulate the body to produce nitric oxide, which is responsible for widening and unclogging of blood vessels. According to a study carried at the Florida state University, people lowered their blood pressure in only six months after gives L-citrulline supplement.