GABA is an amino acid that's beed used by bodybuilders to increase growth hormone (GH) levels for almost 2 decades! There have been literally hundreds of clinical studies on GABA and numerous studies on GABA's ability to elevate growth hormone levels. As with most nutritional studies, GABA research has come directly from the medical community. One noted study from the First Medical Clinic at the University of Milan in Milan, Italy titled, "Effect of acute and repeated administration of gamma aminobutyric acid (GABA) on growth hormone and prolactin secretion in man", shows just how effective GABA is. Muscle and Strength has low prices and cheap, same-day shipping on all GABA supplements!