Glytactin® BUILD 20/20 Oral Supplement Vanilla Flavor Powder 1.2 oz. Individual Packet (1182481_CS) 30/CSVersatile powdered medical food for PKU available for those on a low phenylalanine diet who are seeking more protein, fewer calories and less phenylalanine than other glycomacropeptide based PKU medical foods Glytactin Build 20 20 includes a complete profile of vitamins and minerals and is neutral in flavor so can be taken alone or as a way to build up the protein level of other PKU formulas or low protein food items Contains probiotics to support