GABA or gamma-aminobutyric acid happens to be an inhibitory neurotransmitter in the brain that is crucial for our well being since it helps induce relaxation and sleep. As such, it performs the role of a balancer for the brain by balancing excitation of the brain with inhibition. There is more to GABA than its balancing effects. GABA has a major impact on muscle building and fat prevention due to its effect on HGH levels. GABA stimulates the anterior pituitary thereby increasing Human Growth Hormone (HGH) levels. HGH has anabolic and lipotropic properties and GABA thus indirectly causes these two positive effects in the body. However, people taking GABA supplementation may experience certain side effects that may range from tingling sensations around the face and neck area to mild change in breathing patterns or heart rate. Thankfully, these side effects are not harmful and subside quickly.