... they tend to suppress neuron firing). GABA, which is produced from glutamate, is an inhibitory neurotransmitter. In fact, it's the ... primary inhibitory neurotransmitter in the brain.Since GABA is a naturally-occurring, easily synthesized, physiologically-important compound, it ... form. It's also found in various functional food products.Why is GABA so popular? It appears to reduce anxiety and ...