L-Glutamic acid -14C is L-Glutamic acid labeled with the radioactive isotope carbon-14. L-Glutamic acid is an excitatory amino acid neurotransmitter and an agonist for all subtypes of glutamate receptors (metabotropic, NMDA, and AMPA). L-Glutamic acid acts as an agonist in the release of DA from dopaminergic nerve terminals and can be used in the study of neurological diseases.