DL-Phenylalanine increases levels of certain neurotransmitters in the brain that improves mood, produces less appetite and a mild pain relief. This amino acid produces and activates morphine-like hormones called endorphins, which extends the body’s natural pain responses to injury and diseases. These hormones control the heart rate, blood pressure, oxygen consumption, blood sugar, fat metabolism, and many brain functions. Phenylalanine belongs to the group of amino acids that the body can’t manufacture itself. Powder solution.