Glytactin Build 20/20, 108 calories per 32 gram (1.2 ounce) packet. For the dietary management of phenylketonuria (PKU). Dispensed by prescription. Glytactin BUILD 20/20 is a medical food for PKU patients, ages one year and older. Each packet contains 20 grams of Glytactin protein, now with only 20 mg Phe per serving, the optimal blend of glycomacropeptide (GMP) and amino acids, designed to enhance the protein content of a low Phenylalanine (Phe) diet. A neutral tasting versatile powder to be taken alone or incorporated into beverages and low protein foods. Can be used as a 20 gram low-Phe Glytactin protein booster for any PKU formula. Contains a complete profile of vitamins & minerals and probiotics to support digestive health.