L-Citrulline is a Food for Special Medical Purposes for use under medical supervision. A powdered form of the amino acid L-Citrulline. For use as a supplement in the dietary management of conditions requiring additional L-Citrulline e.g. ornithine carbamyl transferase (OCT) and carbamoyl phosphate synthetase I (CPS) deficiencies. Suitable for use from birth.