NeuroScience's DL-phenylalanine delivers 500 mg/ capsule, allowing practitioners to fine-tune Targeted Amino Acid Therapyż protocols. As the precursor to a number of neurotransmitters, including PEA, dopamine, norepinephrine and epinephrine, DL-phenylalanine can be used to support multiple excitatory neurotransmitters. Available in 60 ct capsule.