4-Amino-3-hydroxybutanoic acid (GABOB) is an endogenous ligand found in the central nervous system in mammals. γ-Amino-β-hydroxybutyric acid is a derivative of the neurotransmitter GABA. It has been claimed to be of value in neurological disorders and to have an antihypertensive effect. γ-Amino-β-hydroxybutyric acid can help overcome stress and anxiety, improve learning and boost memory function. It is also known to increase growth hormone levels, which help the body heal and rejuvenate itself. There are no reported side effects of γ-Amino-β-hydroxybutyric acid when taken at therapeutic dosages. At high dosages, some slight drowsiness may occur. Adverse effects have included dizziness and anorexia also.