Gamma-amino butyric acid (GABA) is one of the major inhibitory neurotransmitters in the central nervous system, balancing the excitatory effects of glutamate on neuronal activity. The inhibitory effects of GABA are generally considered to lessen anxiety, relax muscle tension, and have sedative-like effects. In addition, conditions such as anxiety, depression, insomnia, and epilepsy have all been associated with low GABA concentration or activity. GABA has also been shown to cause a significant increase in alpha brain waves compared to control, indicative of a more relaxed state, as well as better concentration. In a clinical trial involving patients with a fear of heights, GABA-Pro was found to increase salivary levels of sIgA while crossing a suspension bridge, as compared to the control group whose salivary IgA levels dropped 35%. This is indicative of the stress reducing effect of GABA-Pro.
Increasing GABA activity is also a therapeutic target for many medications used in the treatment of insomnia, often by targeting GABA receptors. This has the effect of decreasing waking, shorten sleep latency, and increasing slow-wave sleep.