OstroVit - Histidine is an amino acid...
Swanson's GABA supplement contains gamma-aminobutyric acid, which reduces mental stress and has a calming effect.
Swanson's Sleep Essentials supplement combines melatonin, taurine and GABA with nature's most effective relaxing herbs.
Pure Gold - Sleep dietary supplement with tryptophan, melatonin, herbal extracts and vitamins may contribute to the normal functioning of the nervous system.