K. Shaw, J. Turner, C. Del Mar: Tryptophan and 5-Hydroxytryptophan for depression. In: Cochrane Database of Systematic Reviews. Issue 1, 2002, Art. No.: CD003198. doi:10.1002/14651858.CD003198
M. Rondanelli, A. Opizzi, M. Faliva, M. Bucci, S. Perna: Relationship between the absorption of 5-hydroxytryptophan from an integrated diet, by means of Griffonia simplicifolia extract, and the effect on satiety in overweight females after oral spray administration. In: Eat Weight Disord. 17(1), 2012, S. e22–e28. doi:10.3275/8165. Epub 2011 Dec 5
K. Omori, H. Orima, T. Kojima, H. Takahira: [Pharmacological studies on 5-hydroxy-L-tryptophan (L-5HTP). 1. Influence of L-5HTP on the central nervous system]. In: Nihon yakurigaku zasshi. Folia pharmacologica Japonica. Band 69, Nummer 4, Juli 1973, S. 523–541, PMID 4546003.
M. K. Rahman, T. Nagatsu, T. Sakurai, S. Hori, M. Abe, M. Matsuda: Effect of pyridoxal phosphate deficiency on aromatic L-amino acid decarboxylase activity with L-DOPA and L-5-hydroxytryptophan as substrates in rats. In: Jpn J Pharmacol. Band32, Nr.5, Oktober 1982, S.803–811, PMID 6983619.
G. Carnevale u. a.: Anxiolytic-like effect of „Griffonia simplicifolia“ Baill. seed extract in rats. In: Phytomedicine. 18, 2011, S. 848–851. PMID 21353511.
H. J. Gijsman, J. M. van Gerven, M. L. de Kam u. a.: Placebo-controlled comparison of three dose-regimens of 5-hydroxytryptophan challenge test in healthy volunteers. In: J Clin Psychopharmacol. Band22, Nr.2, April 2002, S.183–189, PMID 11910264.
H. G. Westenberg, T. W. Gerritsen, B. A. Meijer, H. M. van Praag: Kinetics of l-5-hydroxytryptophan in healthy subjects. In: Psychiatry Res. Band7, Nr.3, Dezember 1982, S.373–385, PMID 6187038.
W. F. Byerley, L. L. Judd, F. W. Reimherr, B. I. Grosser: 5-Hydroxytryptophan: a review of its antidepressant efficacy and adverse effects. In: J. Clin. Psychopharmacol. Band7, Nr.3, Juni 1987, S.127–137, PMID 3298325.