L-Tryptophan is widely used in the dietary supplement industry due to its role as a precursor to serotonin, a neurotransmitter that regulates mood, sleep, and appetite. It is often incorporated into products aimed at improving mental health, reducing anxiety, and promoting better sleep quality. In the food industry, it is added to fortified foods and beverages to enhance nutritional value, particularly in products targeting stress relief and relaxation. Additionally, L-Tryptophan is utilized in animal feed to support growth and overall health in livestock, as it is an essential amino acid that animals cannot produce on their own. Its application in pharmaceuticals includes its use in formulations designed to treat conditions like depression and insomnia, leveraging its ability to influence serotonin production.