As an excitatory neurotransmitter, glutamate is behind ADD/ADHD.  Glutamate is also the most abundant neurotransmitter, responsible for regulating over 50% of the nervous system. It is classified as an excitatory neurotransmitter, which means it excites or stimulates nerve cells located throughout the nervous system. As you can imagine, when the brain is overexcited, it will lead to an increase in hyperactivity, impulsivity, and impact movement and motor control.  When glutamate is in excess it is extremely toxic to the brain and nervous system. It can become so excitatory, it is considered an excitotoxin, which means that it [...]