I-L-Tryptophan iyimfuneko ekukhuleni okuqhelekileyo kwiintsana kunye nebhalansi ye-nitrogen kubantu abadala, engenakwenziwa kwizinto ezisisiseko kubantu nakwezinye izilwanyana, ebonisa ukuba ifunyenwe kuphela ngokuthatha i-tryptophan okanye i-tryptophan-equlethe iiprotheni zomzimba womntu, leyo ininzi kakhulu kwitshokolethi, i-oats, ubisi, i-cottage cheese, inyama ebomvu, amaqanda, intlanzi, inkukhu, i-sesame, i-almonds, i-buckwheat, i-spirulina, kunye ne-peanuts, njl. i-anxiolytic, kunye noncedo lokulala.