What Is the Recommended Phenylalanine Intake?
The Recommended Dietary Allowance (RDA) for phenylalanine (plus tyrosine) in adults is 33 mg per kg per day (15 mg per pound per day). Tyrosine is another amino acid included in the RDA for phenylalanine, because phenylalanine is used by the human body to make tyrosine. If you get enough phenylalanine in your diet, you do not need any tyrosine through food. If your phenylalanine intake is too low, however, a dietary intake of tyrosine is important.
