PhenylAde GMP Mix-In 12.5 g Powder Unflavored, 42 Calories Per Pouch. A Powdered Medical Food, Low in Phenylalanine Containing a Balanced Mix of Glycomacropeptide (GMP), Essential and Non-Essential Amino Acids, Some Carbohydrates and Fat. For The Dietary Management of Proven Phenylketonuria (PKU) in Individuals Over 1 Year of Age.