2 to 3 days
Gamma-aminobutyric acid, or GABA, is a non-protein amino acid that functions as a neurotransmitter in the human brain. Its main function is to regulate neuronal activity. Relieves nerve and muscle tension. It has a dampening effect, soothes and protects neurons from damage. It is associated with relaxation. The opposite could be caffeine, which is associated with excitation.