"DL-Pheine, provided by Douglas Laboratories®, provides 500 mg of the D and L forms of the amino acid Phenylalanine. Phenylalanine is an essential amino acid that must be obtained through the diet. Found primarily in high protein sources such as meat and eggs, it plays an important role in regulating the nervous system. LPhenylalanine can be used to metabolize two distinct chemicals, phenylethylamine and tyrosine. Phenylethylamine is a neuroamine which may have regulating effects in mood and feelings of well-being. "