A composition which includes Phenylalanine, Serine, Glutamine and GABA (? - aminobutyric acid). The composition contains the essential amino acids Phenylalanine； Glutamine； the non-essential amino acid Serine； and GABA (?- aminobutyric acid) in concentrations effective to influence or modulate the neurotransmitter pentapeptide enkephalin. The composition may further comprise tetrahydrocannabinol (THC).
