This is a combination of L-phenylalanine, an essential amino acid, and D-phenylalanine, a nonnutrient amino acid that helps promote the production of endorphins, natural painkillers made in the brain.
DLPA is very effective in the relief of chronic pain such as arthritis and back pain. While in most studies there have been no side effects at all from DLPA, it has raised blood pressure in a few people. Although this is unlikely to happen, if you have high blood pressure, please monitor it if you take DLPA. Don't use DLPA in combination with antidepressant drugs or if you have phenylketonuria (PKU).