4-Aminobutyric Acid Hydroiodide is the hydroiodide salt of gamma-aminobutyric acid (GABA), an essential inhibitory neurotransmitter in the central nervous system. It is primarily used in biochemical research to investigate GABAergic signaling pathways and their implications for neurological disorders, including epilepsy, anxiety, and insomnia. This compound supports the development of pharmaceuticals that target GABA receptors for therapeutic interventions in these conditions. In organic synthesis, it serves as a source of GABA for constructing complex molecules, such as heterocyclic compounds. Additionally, the iodide moiety provides utility as an iodine source in specific iodination reactions.