GABA (gamma aminobutyric acid) is a non-essential amino acid found mainly in the human brain and eyes.&ampnbsp; It is considered an inhibitory neurotransmitter, which means it regulates brain and nerve cell activity by inhibiting the number of neurons firing in the brain.&ampnbsp; GABA is referred to as the &ampquot;brain's natural calming agent&ampquot;.&ampnbsp; By inhibiting over-stimulation of the brain, GABA may help promote relaxation and ease nervous tension.*&ampnbsp; NOW provides only the naturally occurring form as found in food and in the body.