Restore Lite Powder, Orange, 65 Calories Per Packet. For the dietary management of phenylketonuria (PKU). Dispensed by prescription. Glytactin RESTORE Lite Powder – Orange is a medical food for PKU patients, ages one year and older. Each packet contains 10 grams of Glytactin protein and contains 55% fewer calories per gram protein equivalent than Glytactin Restore Powder. When added to water, it makes a great tasting fruit-flavored rehydration drink.