Total Science GABA (gamma aminobutyric acid) is a non-essential amino acid that is made in the brain. Unlike most amino acids, GABA is not incorporated into protein, instead it functions as an inhibitory neurotransmitter. GABA has been shown to help relieve anxiety, improve mood, reduce PMS symptoms and may help improve sleep. It is also used for promoting lean muscle growth, burning fat, stabilising blood pressure, and relieving pain; all of which can help you hit your goals quicker. If possible, consider taking GABA on an empty stomach to allow uninterrupted digestion and potentially enhanced absorption.