Reply To: What is GABA ? Home › Welcome to the ADDitude Forums › For Parents › Treating Your Child › What is GABA ? › Reply To: What is GABA ? January 13, 2018 at 9:57 am #73612 rebeccajosephineParticipant I’m on GABA, it’s a neurotransmitter to help calm the brain. I have a diagnosis of Anxiety with some ADHD like symptoms.