GABA (Gamma-AminoButyric Acid):

GABA (gamma-aminobutyric acid), a neurotransmitter (chemical messenger) in the  brain/nervous system, inhibits (blocks) nerve signals and reduces anxiety and stress, promotes a calming effect and sleep, controls muscle tone/movement, regulates breathing and heartrate, and protects neurons from damage. It’s produced naturally in the body, is a dietary supplement and is found in green tea, bananas, tomatoes. Balancing GABA maintains mental and physical health. Low levels can worsen anxiety disorders, epilepsy/seizures, and insomnia.