1. Kimball RW, Friedman AP, Vallejo E. Effect of serotonin in migraine patients. Neurology 1960;10:107-11.
2. Sicuteri F. The ingestion of serotonin precursors (L-5-hydroxytryptophan and L-tryptophan) improves migraine headache. Headache 1973;13:19-22.
3. Titus F, Davalos A, Alom J, Codina A. 5-hydroxytryptophan versus methysergide in the prophylaxis of migraine. Eur Neurol 1986;25:327-9.
4. Maissen CP, Ludin HP. Comparison of the effect of 5-hydroxytryptophan and propranolol in the interval treatment of migraine. Schweizerische Medizinische Wochenschrift /Journal Suisse de Medecine 1991;121:1585-90 [in German].
5. De Benedittis G, Massei R. 5-HT precursors in migraine prophylaxis: A double-blind cross-over study with L-5-hydroxytryptophan versus placebo. Clin J Pain 1986;3:123-9.
6. Mathew NT. 5-hydroxytryptophan in the prophylaxis of migraine. Headache 1978;18:111-3.
7. Bono G, Criscuoli M, Martignoni E, et al. Serotonin precursors in migraine prophylaxis. Advances in Neurology 1982;33:357-63.
8. De Giorgis G, Miletto R, Iannuccelli M, et al. Headache in association with sleep disorders in children: A psychodiagnostic evaluation and controlled clinical study ñ L-5-HTP versus placebo. Drugs Exp Clin Res 1987;13:425-33.
9. Santucci M, Cortelli P, Rossi PG, et al. L-5-Hydroxytryptophan versus placebo in childhood migraine prophylaxis: a double-blind crossover study. Cephalalgia 1986;6:155-7.
10. Ribeiro CAF. L-5-hydroxytryptophan in the prophylaxis of chronic tension-type headache: a double-blind, randomized, placebo-controlled study. Headache 2000;40:451-6.
11. Edmeads J. Placebos and the power of negative thinking. Headache 1984;24:342-3 [editorial].
12. De Benedittis G, Massei R. Serotonin precursors in chronic primary headache. A double-blind cross-over study with L-5-hydroxytrytophan vs. placebo. J Neurosurg Sci 1985;29:239-48.
13. Longo G, Rudoi I, Iannuccelli M, et al. Treatment of essential headache in developmental age with L-5-HTP (cross over double-blind study versus placebo). Pediatr Med Chir 1984;6:241-5. [in Italian].
14. Fava M, Rosenbaum JF, MacLaughlin R, et al. Neuroendocrine effects of S-adenosyl-L-methionine, a novel putative antidepressant. J Psychiatr Res 1990;24:177-84.
15. Bell KM, Potkin SG, Carreon D, Plon L. S-adenosylmethionine blood levels in major depression: changes with drug treatment. Acta Neurol Scand 1994;154(suppl):15-8.
16. Puttini PS, Caruso I. Primary fibromyalgia syndrome and 5-hydroxy-L-tryptophan: a 90-day open study. J Int Med Res 1992;20:182-9.
17. Moldofsky H, Warsh JJ. Plasma tryptophan and musculoskeletal pain in non-articular rheumatism (“fibrositis syndrome”). Pain 1978;5:65-71.
18. Caruso I, Sarzi Puttini P, Cazzola M, Azzolini V. Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome. J Int Med Res 1990;18:201-9.
19. Van Praag HM, Lemus C. Monoamine precursors in the treatment of psychiatric disorders. Nutrition and the Brain, vol. 7, RJ Wurtman, JJ Wurtman, eds. New York: Raven Press, 1986 [review].
20. Van Praag H, de Hann S. Depression vulnerability and 5-hydroxytryptophan prophylaxis. Psychiatry Res 1980;3:75-83.
21. Angst J, Woggon B, Schoepf J. The treatment of depression with L-5-hydroxytryptophan versus imipramine. Results of two open and one double-blind study. Arch Psychiatr Nervenkr 1977;224:175-86.
22. Nolen WA, van de Putte JJ, Dijken WA, et al. Treatment strategy in depression. II. MAO inhibitors in depression resistant to cyclic antidepressants: two controlled crossover studies with tranylcypromine versus L-5-hydroxytryptophan and nimifensine. Acta Psychiatr Scand 1988;78:676-83.
23. Nolen WA, van de Putte JJ, Dijken WA, Kamp JS. L-5-HTP in depression resistant to re-uptake inhibitors. An open comparative study with tranylcypromine. Br J Psychiatry 1985;147:16-22.
24. D'Elia G, Hanson L, Raotma H. L-tryptophan and 5-hydroxytryptophan in the treatment of depression. A review. Acta Psychiatr Scand 1978;57:239-52 [review].
25. Jangid P, Malik P, Singh P, et al. Comparative study of efficacy of L-5-hydroxytryptophan and fluoxetine in patients presenting with first depressive episode. Asian J Psychiatr 2013;6:29–34.))
26. Birdsall TC. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Alternative Med Rev 1998;3:271-80.
27. Schneider-Helmert D, Spinweber CL. Evaluation of L-tryptophan for treatment of insomnia: A review. Psychopharmacology (Berlin) 1986;89(1):1-7.
28. Lindsley JG, Hartmann EL, Mitchell W. Selectivity in response to L-tryptophan among insomniac subjects: a preliminary report. Sleep 1983;6:247-56.
29. Wyatt RJ, Zarcone V, Engelman K, et al. Effects of 5-hydroxytryptophan on the sleep of normal human subjects. Electroencephalogr Clin Neurophysiol 1971;30:505-9.
30. Puttini PS, Caruso I. Primary fibromyalgia syndrome and 5-hydroxy-L-tryptophan: a 90-day open study. J Int Med Res 1992;20:182-9.
31. Bruni O, Ferri R, Miano S, Verrillo E. L-5-Hydroxytryptophan treatment of sleep terrors in children. Eur J Pediatr 2004;163:402-7.
32. Guyton AC, Hall JE. Textbook of Medical Physiology, 9th ed. Philadelphia: W. B. Saunders, 1996.
33. Schneider-Helmert D, Spinweber CL. Evaluation of L-tryptophan for treatment of insomnia: A review. Psychopharmacology (Berlin) 1986;89(1):1-7.
34. Caruso I, Sarzi Puttini P, Cazzola M, Azzolini V. Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome. J Int Med Res 1990;18:201-9.
35. Soulairac A, Lambinet H. Etudes cliniques de líaction du precurseur de la serotonine le L-5-hydroxy-tryptophane, sur les troubles du sommeil. Schweiz Bundschau Med (PRAXIS) 1998;77(34a):19-23 [in French].
36. Young SN. Behavioral effects of dietary neurotransmitter precursors: basic and clinical aspects. Neurosci Biobehav Rev 1996;20:313-23 [review].
37. Riemann D, Vorderholzer U. Treatment of depression and sleep disorders. Significance of serotonin and L-tryptophan in pathophysiology and therapy. Fortschr Med 1998;116:40-2 [review].
38. Chouinard G, Jones BD, Young SN, Annable L. Potentiation of lithium by tryptophan in a patient with bipolar illness. Am J Psychiatry 1979;136:719-20.
39. Hedaya RJ. Pharmacokinetic factors in the clinical use of tryptophan. J Clin Psychopharmacol 1984;4:347-8.
40. Prange AJ, Wilson IC, Lynn CW, et al. L-tryptophan in mania: contribution to a permissive hypothesis of affective disorders. Arch Gen Psychiatry 1974;30:56-62.
41. Chambers CA, Naylor GJ. A controlled trial of L-tryptophan in mania. Br J Psychiatry 1978;132:555-9.
42. Murphy DL, Maker M, Goodwin FK, et al. L-tryptophan in affective disorders: indoleamine changes and differential clinical effects. Psychopharmacologia 1974;34:11-20.
43. van Praag HM, de Haan S. Chemoprophylaxis of depressions. An attempt to compare lithium with 5-hydroxytryptophan. Acta Psychiatr Scand Suppl 1981;290:191-201.
44. Mendlewicz J, Youdim MB. Antidepressant potentiation of 5-hydroxytryptophan by L-deprenil in affective illness. J Affect Disord 1980;2:137-46.
45. Gaby, AR. Nutritional Medicine. Concord, NH: Fritz Perlberg Publishing, 2011.
46. Caruso I, Sarzi Puttini P, Cazzola M, Azzolini V. Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome. J Int Med Res 1990;18:201-9.
47. Byerley WF, Judd LL, Reimherr FW, Grosser BI. 5-hydroxytryptophan: A review of its antidepressant efficacy and adverse effects . J Clin Psychopharmacol 1987;7:127-37 [review].
48. Zmilacher K, Battegay R, Gastpar M. L-5-hydroxytryptophan alone and in combination with a peripheral decarboxylase inhibitor in the treatment of depression. Neuropsychobiology 1988;20:28-35.
49. Poldinger W, Calanchini B, Schwarz W. A functional-dimensional approach to depression: serotonin deficiency as a target syndrome in a comparison of 5-hydroxytryptophan and fluvoxamine. Psychopathology 1991;24(2):53-81.
50. Soulairac A, Lambinet H. Etudes cliniques de líaction du precurseur de la serotonine le L-5-hydroxy-tryptophane, sur les troubles du sommeil. Schweiz Bundschau Med (PRAXIS) 1998;77(34a):19-23 [in French].
51. De Benedittis G, Massei R. 5-HT precursors in migraine prophylaxis: A double-blind cross-over study with L-5-hydroxytryptophan versus placebo. Clin J Pain 1986;3:123-9.
52. Titus F, Davalos A, Alom J, Codina A. 5-hydroxytryptophan versus methysergide in the prophylaxis of migraine. Eur Neurol 1986;25:327-9.
53. Maissen CP, Ludin HP. Comparison of the effect of 5-hydroxytryptophan and propranolol in the interval treatment of migraine. Schweizerische Medizinische Wochenschrift /Journal Suisse de Medecine 1991;121:1585-90 [in German].
54. Mathew NT. 5-hydroxytryptophan in the prophylaxis of migraine. Headache 1978;18:111-3.
55. De Giorgis G, Miletto R, Iannuccelli M, et al. Headache in association with sleep disorders in children: A psychodiagnostic evaluation and controlled clinical study ñ L-5-HTP versus placebo. Drugs Exp Clin Res 1987;13:425-33.
56. Ribeiro CAF. L-5-hydroxytryptophan in the prophylaxis of chronic tension-type headache: a double-blind, randomized, placebo-controlled study. Headache 2000;40:451-6.
57. Ceci F, Cangiano C, Cairella M, et al. The effects of oral 5-hydroxytryptophan administration on feeding behavior in obese adult female subjects.J Neural Transm 1989;76(2):109-17.
58. Cangiano C, Ceci F, Cascino A, et al. Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan. Am J Clin Nutr 1992;56:863-7.
59. Cangiano C, Laviano A, Del Ben M, et al. Effects of oral 5-hydroxy-tryptophan on energy intake and macronutrient selection in non-insulin dependent diabetic patients. Int J Obes Relat Metab Disord 1998;22:648-54.
60. van Praag HM, Lemus C. Monoamine precursors in the treatment of psychiatric disorders. Nutrition and the Brain, vol. 7, eds. RJ Wurtman, JJ Wurtman. New York: Raven Press, 1986 [review].
61. Russell IJ, Michalek JE, Vipraio GA, et al. Platelet 3H-imipramine uptake receptor density and serum serotonin levels in patients with fibromyalgia/fibrositis syndrome. J Rheumatol 1992;19:90-4.
62. Yunus MB, Dailey JW, Aldag JC, et al. Platelet 3H-imiprimine uptake receptor density and serum serotonin levels in patients with fibromyalgia/fibrositis syndrome. J Rheumatol 1992;19:104-9.
63. Wolfe F, Russell IJ, Vipraio G, et al. Serotonin levels, pain threshold, and fibromyalgia symptoms in the general population. J Rheumatol 1997;24:555-9.
64. Kimball RW, Friedman AP, Vallejo E. Effect of serotonin in migraine patients. Neurology 1960;10:107-11.
65. Schneider-Helmert D, Spinweber CL. Evaluation of L-tryptophan for treatment of insomnia: A review. Psychopharmacology (Berlin) 1986;89(1):1-7.
66. Williamson BL, Benson LM, Tomlinson AJ, et al. On-line HPLC-tandem mass spectrometry analysis of contaminants of L-tryptophan associated with the onset of the eosinophilia-myalgia syndrome. Toxicol Lett 1997;92:139-48.
67. Williamson BL, Klarskov K, Tomlinson AJ, et al. Problems with over-the-counter 5-hydroxy-L-tryptophan. Nat Med 1998;4:983.
68. Williamson BL, Tomlinson AJ, Mishra PK, et al. Structural characterization of contaminants found in commercial preparations of melatonin: similarities to case-related compounds from L-tryptophan associated with eosinophilia-myalgia syndrome. Chem Res Toxicol 1998;11:234-40.
69. Belongia EA, Hedberg CW, Gleich GJ, et al. An investigation of the cause of the eosinophilia-myalgia syndrome associated with tryptophan use. N Engl J Med 1990;323:357-65.
70. Martin RW, Duffy J, Engel AG, et al. The clinical spectrum of the eosinophilia-myalgia syndrome associated with L-tryptophan ingestion. Clinical features in 20 patients and aspects of pathophysiology. Ann Intern Med 1990;113:124-34.
71. Mayeno AN, Lin F, Foote CS, et al. Characterization of “peak E,” a novel amino acid associated with eosinophilia-myalgia syndrome. Science 1990;250:1707-8.
72. Reinauer S, Plewig G. [Eosinophilia-myalgia syndrome]. Hautarzt 1991;42(3):137-9 [in German].
73. Toyo'oka T, Yamazaki T, Tanimoto T, et al. Characterization of contaminants in EMS-associated L-tryptophan samples by high-performance liquid chromatography. Chem Pharm Bull (Tokyo) 1991;39(3):820-2.
74. Trucksess MW, Thomas FS, Page SW. High-performance liquid chromatographic determination of 1,1'-ethylidenebis(L-tryptophan) in L-tryptophan preparations. J Pharm Sci 1994;83(5):720-2.
75. Trucksess MW. Separation and isolation of trace impurities in L-tryptophan by high-performance liquid chromatography. J Chromatogr 1993;630(1-2):147-50.
76. Ito J, Hosaki Y, Torigoe Y, Sakimoto K. Identification of substances formed by decomposition of peak E substance in tryptophan. Food Chem Toxicol 1992;30(1):71-81.
77. Castot A, Bidault I, Bournerias I, et al. [“Eosinophilia-myalgia” syndrome due to L-tryptophan containing products. Cooperative evaluation of French Regional Centers of Pharmacovigilance. Analysis of 24 cases]. Therapie 1991;46(5):355-65 [in French].
78. Michelson D, Page SW, Casey R, et al. An eosinophilia-myalgia syndrome related disorder associated with exposure to L-5-hydroxytryptophan. J Rheumatol 1994;21:2261-5.
79. Sternberg EM, Van Woert MH, Young SN, et al. Development of a scleroderma-like illness during therapy with L-5-hydroxytryptophan and carbidopa. N Engl J Med 1980;303:782-7.
80. Johnson KL, Klarskov K, Benson LM, et al. Presence of peak X and related compounds: the reported contaminant in case related 5-Hydroxy-L-tryptophan associated with eosinophilia-myalgia syndrome. J Rheumatol 1999;26(12):2714-7.
81. Hagan JJ, Hatcher JP, Slade PD. The role of 5-HT1D and 5-HT1A receptors in mediating 5-hydroxytryptophan induced myoclonic jerks in guinea pigs. Eur J Pharmacol 1995;294:743-51.
82. Green AR, Johnson P, Mountford JA, Nimgaonkar VL. Some anticonvulsant drugs alter monoamine mediated behaviour in mice in ways similar to electroconvulsive shock; implications for antidepressant therapy. Br J Pharmacol 1985;84:337-46.
83. Bourin M, Hascoet M, Deguiral P. 5-HTP induced diarrhea as a carcinoid syndrome model in mice? Fundam Clin Pharmacol 1996;10:450-7.
84. Hirai M, Nakajima T. Biochemical studies on the mechanism of difference in the renal toxicity of 5-hydroxy-L-tryptophan between Sprague Dawley and Wistar rats. J Biochem (Tokyo) 1979;86:907-13.
85. Martin TG. Serotonin syndrome. Ann Emerg Med 1996;28:520-6.
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