PKU REFRESH AA 15, Lemon Lime, 16 Fl Oz, 90 Calories per Bottle.PKU REFRESH AA 15 Lemon Lime is phenylalanine free amino acid based ready to drink medical food with electrolytes for the dietary management of a person with Phenylketonuria. Each 16 fl oz. (480ml) serving contains 15g protein equivalent in a great tasting hydration beverage. It is indicated for ages one year and older.