DL-Phenylalanine is a combination of L-Phenylalanine and D-Phenylalanine. Phenylalanine is an essential amino acid that is crucial to maintaining health. DL-Phenylalanine has many health benefits, such as helping to boost mood and give a feeling of overall well-being and supporting the brain.* It may also help support the liver and contribute to overall health and wellness.** These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.