γ-Aminobutyric acid (GABA) is a naturally occurring neurotransmitter in the central nervous system that helps regulate neuronal excitability, control muscle tone, and reduce anxiety. It is commonly used in research on neurological disorders and as a dietary supplement to promote relaxation and improve sleep quality. In pharmaceuticals, it serves as a key component in treatments for epilepsy, hypertension, and insomnia. Additionally, due to its calming effects, GABA is incorporated into functional foods, nutraceuticals, and cosmetic products, particularly in skincare formulations for soothing irritated skin, reducing stress-related aging, and providing anti-inflammatory benefits in cosmetic-grade applications.