Redcon1 Basic Training L-Citrulline 60 is the natural form of amino acid citrulline. Citrulline supports vasodilation through NO (nitric oxide) production, helping to improve blood flow and muscle pumps during a workout. L-citrulline is the natural form of amino acid citrulline. Citrulline helps boost nitric oxide levels to help increase blood flow and deliver nutrients to your muscles, creating the ‘pump’ effect. L-Citrulline act as a vasodilator a substance that widens the veins and arteries to help improve blood flow which helps in enhancing physical exercise, Improving athletic performance. It makes to focus on intense workouts.