One third of a medium sized cucumber is an excellent source of vitamin K, and contains small amounts of some of the B vitamins, vitamin C, potassium and manganese. It also contains phytonutrients.
Two cups of watermelon provide an excellent source of vitamins A and C, as well as small amounts of some of the B vitamins, potassium, manganese, copper, magnesium and fiber. Watermelon also contains lycopene, a phytonutrient and red pigment which may reduce the risk of certain types of cancer.
Both watermelons and cucumbers contain an amino acid (protein) citrulline, which helps to keep blood vessels healthy.