PKU Sphere 20 Liquid, Vanilla, 8 fl. oz. (237 mL). 120 calories per 237 mL Tetra Pak. 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 8 full ounce bottle contains 30mg of phenylalanine. PKU sphere liquid is suitable for 3 years of age and older. New resealable cap and recyclable Tetra Pak packaging.