PKU Sphere 20 Liquid is a ready-to-drink low phenylalanine medical food for the dietary management of Phenylketonuria. PKU sphere is a blend of glycomacropeptide (GMP), essential and non-essential amino acids, carbohydrate, fat (including docosahexaenoic acid - DHA), vitamins and minerals. Each eight full ounce bottle contains 30mg of phenylalanine. PKU sphere liquid is suitable for three years of age and older.