L-Citrulline is one of the amino-acids, and since it is extracted from watermelon, it was given the watermelon's Latin name "citrullus". Apart from L-Citrulline, L-Arginine, Vitamine C, Vitamine E, folic acid were added to boost up L-Citrulline's health-sustaining effects. This product is recommended as a day-to-day health supplement.