PhenylAde GMP ULTRA, Lemonade Flavor, 98 Calories per 33.3g Pouch. A powdered medical food, low in phenylalanine containing a balanced mix of glycomacropeptide (GMP), essential and non-essential amino acids, vitamins, minerals, trace elements as well as small amounts of carbohydrate and fat. For the dietary management of proven Phenylketonuria (PKU) in individuals over 3 year of age.