Gamma-aminobutyric acid (GABA) serves to fill brain receptor sites so that other messages cannot be transmitted. Activation of GABA receptors favor sleep.
While GABA is an amino acid, it is classified as a neurotransmitter. It is the most abundant inhibitory neurotransmitter in the brain and can influence brain function.
Niacinamide and inositol enhance the effects of GABA.