Glytactin Swirl 15, Chocolate. 160 calories per packet. 2240 calories per case.For the dietary management of phenylketonuria (PKU). Glytactin Swirl is a low phenylalanine glycomacropeptide (GMP)- based powdered medical food complete with vitamins and minerals. Each packet contains 15 mg Phe per 15 grams of protein, a balanced blend of GMP plus amino acids. Swirl is versatile as it can be mixed as a pudding or a drink. Contains DHA and probiotics. Suitable for individuals over 1 year of age. Dispensed by prescription.