TYR express15 25g Sachet, 74 Calories Per Packet. A tyrosine and phenylalanine free protein substitute for use in the dietary management of Tyrosinemia in individuals aged 3 years and older. TYR express15 must only be given to patients with proven Tyrosinemia and under strict medical supervision. It is not recommended for children under 3 years of age or as a sole source of nutrition. The product does contain a source of phenylalanine. TYR express15 is not for parenteral use.