The semi-essential amino acid L-citrulline is a very popular muscle pump ingredient, which is why it is also used in products like our Pump Fuel. Citrulline is converted into arginine in your body, which in turn contributes to nitric oxide formation in the blood. The combination of L-citrulline and L-arginine can extend this popular effect. PREMIUM QUALITY - Our citrulline comes in the premium compound DL-malate 2:1, which means it carries significantly more bioactive citrulline than simple malates. • Excellent bioavailability through malate compound • High active ingredient density due to 2:1 ratio • Time release effect in combination with arginine • 100% sourced from vegan sources and free from additives • Packaged in environmentally friendly mono-plastic bags