Another possible addition to the PKU diet may be a supplement called neutral amino acid therapy powder or tablets.

CNN: Phenylketonuria (PKU)

Without PKU formula, your body can't get enough of essential nutrients called amino acids that are crucial for growth and general health.

CNN: Phenylketonuria (PKU)

Doctors used to believe it was OK for a person with PKU to stop the diet in adolescence, but today, doctors recommend sticking to the diet and PKU formula for life.

CNN: Phenylketonuria (PKU)