What Is GABA? Mental Health America explains gamma-aminobutyric acid, its calming role in the brain, and how low levels may relate to anxiety, sleep, and mood

GABA, or gamma-aminobutyric acid, is a neurotransmitter that helps slow brain activity and supports calm, sleep, and emotional regulation. Low GABA activity is commonly linked with anxiety, stress, restlessness, and sleep difficulty, while balanced signaling helps the nervous system avoid overstimulation. GABA works by reducing the firing of neurons, acting as part of the brain's inhibitory system. Mental health discussions around GABA often connect it with panic, mood changes, and insomnia, and with medications that influence GABA receptors to produce sedating or anti-anxiety effects. GABA sits at the center of how the brain balances excitation and inhibition. That balance matters for everyday mental well-being and for understanding why some psychiatric symptoms, stress responses, and sleep problems can feel physically hard to control.