Gamma-aminobutyric acid, commonly known as GABA, is a neurotransmitter in the brain that plays a crucial role in regulating neuronal excitability. It functions by inhibiting nerve transmission, which helps to calm the nervous system and reduce feelings of anxiety and stress. GABA is naturally produced in the body and is essential for maintaining a balance between excitation and inhibition in the brain. In addition to its natural occurrence, GABA is also available as a dietary supplement. Some people take GABA supplements in hopes of improving sleep quality, reducing anxiety, or enhancing mood. However, the effectiveness of these supplements can vary, and more research is needed to fully understand their benefits and potential side effects.