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| L-phenylalanine (LPA) serves as a building block for the various proteins that are produced in the body. D-phenylalanine (DPA) is not normally found in the body and cannot be converted to L-tyrosine, L-dopa, or norepinephrine. DLPA is a mixture of the essential amino acid LPA and its mirror image DPA. LPA is found in most foods that contain protein. Although rare, individuals whose diets are very low in protein may develop a deficiency of L-phenylalanine. Benefits of supplementation are typically achieved in the absence of an outright deficiency. Consistent toxicity in healthy people has not been reported with 1,500mg per day or less of DLPA, except for occasional nausea, heartburn, or transient headaches. Until more is known, it makes sense for people with this condition to avoid phenylalanine supplementation. |
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