Glytactin BUILD 10 Oral Supplement Neutral Flavor Powder 15 ml Individual Packet - 30 Count CaseOral Supplement Glytactin BUILD 10 Neutral Flavor Powder 0. 5 oz. Individual Packet Glytactin Build is designed to make Glytactin protein available for those on a low phenylalanine diet who are seeking more protein and fewer calories than traditional PKU medical foods. 10 grams of protein equivalent per packet. No artificial flavoring or coloring. There are 30 half ounce packets of powder mix in a case.