NutraBio Citrulline Powder is 100% pure fermented L-citrulline with zero fillers, flavors, or additives. Each scoop delivers 3g of free-form citrulline that converts to arginine in the kidneys for sustained nitric oxide production and vasodilation. Unflavored for flexible stacking with any beverage or pre-workout. 50 servings per tub, third-party tested.