PKU GMPro Mix-In is a Food for Special Medical Purposes for use under medical supervision. PKU GMPro Mix-In is an unflavoured, nutritionally incomplete, low phenylalanine* powdered protein source containing glycomacropeptide (GMP), with essential and non-essential amino acids, a small amount of carbohydrate and some minerals. PKU GMPro Mix-In is available in 30 x 12.5g sachets. *PKU GMPro Mix-In contains 18.0mg of phenylalanine per 12.5g sachet. This should be taken into consideration as part of the patient’s overall dietary intake. Protein substitutes based on GMP are a natural source of phenylalanine.