DL-Phenylalanine (DLPA), Phenylalanine, or L-Phenylalanine in its natural form, is an essential amino acid that has important nutritional value and has also been shown to help with a number of health concerns.

DLPA is a known nutritional precursor of the neurotransmitters dopamine, norepinephrine, and epinephrine. 

These neurotransmitters control or affect heart rate and output, blood pressure, oxygen consumption, blood sugar levels, fat metabolism and other brain functions.