L-Tryptophan ndiyofunikira pakukula kwabwino kwa makanda komanso kuchuluka kwa nayitrogeni mwa akulu, omwe sangathe kupangidwa kuchokera kuzinthu zofunika kwambiri mwa anthu ndi nyama zina, kutanthauza kuti amangotenga tryptophan kapena tryptophan yokhala ndi mapuloteni a thupi la munthu, chomwe chimakhala chochuluka makamaka mu chokoleti, oats, mkaka, kanyumba tchizi, nyama yofiira, mazira, nsomba, nkhuku, sesame, amondi, buckwheat, spirulina, ndi mtedza, ndi zina zotero. anxiolytic, ndi chithandizo cha kugona.