From the Manufacturer:
"An amino acid supplement for specialized dietary support
Provides effective support for healthy mood and other mental function
Also delivers potent support for joint flexibility
Get a nutritional boost for mobility and mental health with DL-Phenylalanine! A great source of amino acid precursors for neurotransmitters that help regulate mood and other mental functions, DL-Phenylalanine also provides valuable support for joint flexibility."