L Citrulline from Zoomad Labs is an amino acid characterized as a precursor to arginine. It is a non-essential amino acid. Our body can produce it itself in the quantities it needs at any given time, and it is also able to manufacture it from other amino acids, such as glutamine. L Citrulline from Zoomad Labs is a precursor to arginine and nitric oxide, an amino acid responsible for vasodilation. Taking it can improve tissue absorption of oxygen and improve exertion. It is an amino acid that is well digestible. Once it is metabolized in the blood, it reaches the kidneys to be transformed into arginine. This is one of its basic functions, and in this way it contributes to maintaining the health of the arteries and muscles.