L-Tryptophan e manaʻomia mo le tuputupu aʻe masani o pepe ma mo le paleni o le nitrogen i tagata matutua, lea e le mafai ona faʻapipiʻiina mai isi mea faʻavae i totonu o tagata ma isi meaola, faʻapea e maua mai i le taumafaina o le tryptophan poʻo le tryptophan-o loʻo i ai polotini mo le tino o le tagata, lea e sili ona tele i sukalati, oats, susu, sisi sisi, aano mumu, fuamoa, iʻa, moa, sesame, almonds, buckwheat, spirulina, ma pinati, ma isi. popolevale, ma fesoasoani moe.