3-Aminobutyric acid, also known as β-aminobutyric acid (BABA), is a non-protein amino acid used primarily in agriculture as a biostimulant. It induces systemic acquired resistance in plants, enhancing defense against pathogens, pests, and abiotic stresses such as drought and salinity, thereby improving crop yield and quality. In pharmaceutical research, it serves as an intermediate in organic synthesis for various compounds and is studied for potential neuroprotective effects, including antioxidant activity and modulation of neurotransmitter systems, with applications explored in neurodegenerative disorders like Alzheimer's and Parkinson's, as well as anxiety and epilepsy. It is also incorporated into dietary supplements for possible benefits in stress reduction, sleep improvement, and immune support. In the cosmetic industry, its antioxidant properties are utilized in formulations aimed at skin protection and anti-aging.