Features Versatile glycomacropeptide (GMP) based-protein powdered medical food for the dietary management of PKU for those on a low phenylalanine diet and are seeking more protein, fewer calories and lower Phe than other GMP-based PKU medical foods Nutritionally complete with vitamins and minerals Made with GMPure: The lowest Phe GMP protein-based medical foods for PKU Mixes with 4 oz. of water 20 mg Phe Contains DHA to support brain and heart health Contains probiotics to support digestive health No artificial colors or flavors Always use Glytactin BUILD 20/20 Smooth as directed by your physician or dietitian