γ-氨基丁酸 (gamma-aminobutyric acid, or GABA) is a naturally occurring neurotransmitter in the central nervous system. It plays a crucial role in reducing neuronal excitability throughout the nervous system, helping to regulate mood and anxiety levels. GABA is synthesized from glutamate, another important neurotransmitter, and is involved in various physiological processes. In addition to its role in the brain, GABA is also available as a dietary supplement. Some people use it to promote relaxation and improve sleep quality. Research on GABA supplements is ongoing, with studies exploring their potential benefits for anxiety, stress, and overall mental health.