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In page Phenylketonuria:

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Another treatment strategy is casein glycomacropeptide (CGMP), which is a milk peptide naturally free of Phe in its pure form[3] CGMP can substitute for the main part of the free amino acids in the PKU diet and provides several beneficial nutritional effects compared to free amino acids. The fact that CGMP is a peptide ensures that the absorption rate of its amino acids is prolonged compared to free amino acids and thereby results in improved protein retention[4] and increased satiety[5] compared to free amino acids. Another important benefit of CGMP is that the taste is significantly improved[4] when CGMP substitutes part of the free amino acids and this may help ensure improved compliance to the PKU diet.[citation needed]