WATER MELONCONTAINS CITRULLLINE
The organic compound citrulline is an α-amino acid. Its name is derived from citrullus, the Latin word for watermelon, from which it was first isolated in 1914 by Koga & Odake. It was finally identified by Wada in 1930
Citrulline is a compound which helps relax the blood vessels, similar to a man who takes viagra. This effect is also beneficial to the heart circulatory and the immune system.