L-citrulline-malate gets converted to L-arginine, another type of amino acid. L-arginine improves blood flow, It does so by creating nitric oxide (NO). Nitric oxide is one of the chemicals that causes vasodilation, or widening of the blood vessels, when you exercise. Simply put muscles get more blood flow during your workout.
*L-citrulline is an amino acid normally made by the body, using a pre-workout will help assist your body on getting more of what it needs during your workout.
Matrix Pre-workout includes L-citrulline-malate as the first ingredient.