An amino acid supplement for specialized dietary support Plays a key role in neurotransmitter function 500 mg per capsule Get a nutritional boost with Swanson DL- Phenylalanine (DLPA)! A great source of amino acid precursors for neurotransmitters that support brain health, DL-Phenylalanine is an essential amino acid that cannot be made in the body and must be supplied by food.
