Source Naturals L-Tryptophan 500mg， 120 Capsules<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Essential amino acid that helps support mood， relaxation， and restful sleep </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Plays a part in the synthesis of both melatonin and serotonin， hormones involved with mood and stress response </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Supports immune functions， as the body's precursor to the kynurenines that regulate immunity </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Extremely pure and regularly tested to ensure the highest standards of quality </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Promotes drowsiness and good quality sleep in cases of mild insomnia and tryptophan </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41JtCClusqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41lO92tFMPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41qalvVhBWL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41-D3vfyilL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4159YStfk5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41xeUSxJYPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/418ArBxK7zL.jpg" noproxy>