Cambrooke Foods Glytactin™ Ready-to-Drink 10 Chocolate 8.5 oz, 153 Calories per Carton, For PKU Patients Glytactin™ RTD 10 (10g of Protein Equivalent [PE]) is the first and only whole protein complete metabolic formula in a ready-to-drink form for the dietary management of PKU. Intended for those who are under medical supervision for proven PKU. Protein in prescribed amounts must be supplemented to completely meet phenylalanine requirements.