Amino acid-based protein dietary supplement containing only L-citrulline. Food for special medical uses for the dietary management of infants, children and adults with the following urea cycle disorders: ornithine carbamyl transferase deficiency (OCT), carbamyl phosphate synthetase deficiency (CPS) and lysinuria with protein intolerance, as well as other metabolic disorders that require an additional supply of L-citrulline. Provides 2.4 g of nitrogen per 10 g of product. Does not contain milk protein, gluten, lactose, fructose or sucrose.