GABA (gamma-aminobutryc acid) is an essential inhibitory neurotransmitter produced by the brain. GABA suppresses nerve impulses related to stress and anxiety and thus is conducive to relaxation and sleep. GABA promotes the anterior pituitary and increases levels of Human Growth Hormone (HGH), which is anabolic (muscle building) and lipotropic (fat preventing). In other words, GABA helps lose fat and improve lean muscle. HGH level lowers with age, so supplementation is beneficial.