Gamma aminobutyric acid, required as an inhibitory neurotransmitter to block the transmission of an impulse from one cell to another in the central nervous system, which prevents over-firing of the nerve cells. It is used to treat both epilepsy and hypertension.
The main calming (inhibitory) neurotransmitter in the CNS and it inhibits (or blocks) neuronal activity. Boosting its action induces feelings of calm and reduces anxiety. Benzodiazepine antianxiety drugs and a number of calming plants act to increase the efficiency of GABA (by modulating the GABAA receptor and via other mechanisms).