Glytactin BetterMilk 15, Strawberry Creme, 1.4 oz. (40g) Packet, 160 Calories Per Packet. Glytactin BetterMilk 15, Strawberry Crme flavored, is powdered medical food for the dietary management of phenylketonuria (PKU), ages one year and older. Each packet contains 15 grams of Glytactin protein with GMPure, which is Cambrooke's lowest Phe Glycomacropeptide (GMP), balanced with an optimized blend of amino acids. It is nutritionally complete with vitamins and minerals and DHA and contains probiotics to support digestive health. Dispensed by prescription.