Source Naturals Serene Science GABA Calm combines two of the main inhibitory neurotransmitters, GABA and glycine, with N-acetyl L-tyrosine, which is a precursor to the neurotransmitters dopamine and norepinephrine. In addition, taurine supports the calming effects of GABA. The lozenge form dissolves in the mouth for quick and convenient delivery. The suggested use is to take 1 lozenge, 1 to 3 times daily. For best results, allow to dissolve in the mouth before swallowing. Please contact our in-house customer support if you have any questions.