HealthWise® GABA: Gamma Amino Butyric Acid is 100% pure pharmaceutical grade powder. GABA is produced in the brain (Amygdala) where it may inhibit excitable neurotransmitters and promote relaxation. Those participating in weight-bearing exercise may find GABA useful for increasing performance and promoting lean muscle mass. DID YOU KNOW? All sorts of other unexpected things change GABA activity, for example, the chemicals formed by aging whiskey in oak barrels increase GABA’s effect in the brain when the chemicals released from the alcohol as a fragrance and reach the brain via inhalation. The fragrance of Oolong tea has a similar effect, increasing GABA’s action as does, to a lesser extent, extracts of green and black tea.