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Tr5.5
Tryptophan – Forschung
Hilft wahrscheinlich
151 begutachtete Studien
Was die Evidenz sagt
Hilft wahrscheinlich
Tryptophan scheint in 5 von 7 Studien mit messbaren Effekten zu helfen — die Evidenz tendiert klar ins Positive.
Die meiste Evidenz stammt aus hochwertigen Meta-Analysen und randomisierten Studien, veröffentlicht 1970–2026 mit einer typischen Studiengröße von 70 Teilnehmenden.
Basierend auf 151 Studien · 12 Meta-Analysen · 106 RCTs · 25,464 Teilnehmende insgesamt
Konfidenz
Hohe Konfidenz
Was die Studien gefunden haben
5geholfen2unklar· 144 weitere ohne bewertete Effektdaten
Nach Outcome
Depression & moodVerbesserte Stimmung durch Serotonin-Unterstützung · 1-2 weeks
Hilft vermutlich136 Studien
Therapeutic & clinical
Hilft wahrscheinlich36 Studien
Sleep & insomniaVerkürzte Einschlaflatenz · 30-60 minutes · Bessere Schlafqualität · 1-2 weeks · Anhaltende Serotonin- und Melatonin-Synthese unterstützt die Aufrechterhaltung des Schlafs · 1-2 weeks
Hilft vermutlich17 Studien
Inflammation
Überwiegend Mechanismus / Beobachtung15 Studien
Cognitive function
Überwiegend Mechanismus / Beobachtung10 Studien
Weight management
Überwiegend Mechanismus / Beobachtung10 Studien
Women's health
Überwiegend Mechanismus / Beobachtung7 Studien
Safety profile
Überwiegend Mechanismus / Beobachtung7 Studien
Anxiety & stressSerotonin-Vorläufer reduziert Angst bei Personen mit Tryptophan-Depletion · 2-4 weeks
Überwiegend Mechanismus / Beobachtung6 Studien
Glucose & metabolic
Überwiegend Mechanismus / Beobachtung3 Studien
Energy & fatigue
Überwiegend Mechanismus / Beobachtung3 Studien
Endurance & exercise performance
Zu wenige bewertete Studien1 Studie
In Zahlen
Aus 42 Studien mit messbaren Effekten gezogen
Wahrscheinlich echte Effekte
50%
über Studien hinweg
Untersuchte Personen
25k
typische Studie: 70 Personen
Stärkste Designs
118
12 gepoolt, 106 randomisiert
Zeigte Nutzen
71%
5/7 Studien
Wie lange Studien liefen
1–4 Wochen
1
1–3 Monate
2
Untersuchte Populationen
General population3
Patients with depressive disorders1
Patients with major depressive disorder with melancholic and psychotic features1
Bipolar disorder patients1
Aktives Forschungsgebiet
54 Studien in den letzten 5 Jahren · Neueste Meta-Analyse: 2026
197019982026
1Depressive disorder symptom improvementMeta-Analysen=17,437 · very large study2025
Einfach gesagt: This extensive systematic review and NMA of nutraceuticals for treating depressive disorders indicated a number of nutraceuticals that could offer benefits, either as adjuncts or monotherapies.
Cheng YC et al. · Psychological medicine (2025)
Adjunctive nutraceuticals consistently showed better efficacy than antidepressants (ADT) alone in outcomes including SMD, remission, and response.
This extensive systematic review and NMA of nutraceuticals for treating depressive disorders indicated a number of nutraceuticals that could offer benefits, either as adjuncts or monotherapies.
2Tryptophan and metabolite levels in severe depressionMeta-Analysen=4,647 · very large study2022
Einfach gesagt: Patients with affective disorders with melancholic and psychotic features and suicidal behaviors showed normal IDO enzyme activity but a lowered availability of plasma/serum TRP to the brain, which is probably due to other processes such as low albumin levels.
Almulla AF et al. · Cells (2022)
Groß Nutzen
← SchlechterKein EffektBesser →
Likely real
Severe patients showed significant lower (p < 0.0001) TRP (standardized mean difference, SMD = -0.517, 95% confidence interval, CI: -0.735; -0.299) and TRP/CAAs (SMD = -0.617, CI: -0.957; -0.277) levels with moderate effect sizes, while no significant difference in CAAs were found.
Kynurenine (KYN) levels were unaltered in severe MDD/BD phenotypes, while the KYN/TRP ratio showed a significant increase only in patients with psychotic features (SMD = 0.224, CI: 0.012; 0.436).
Quinolinic acid (QA) was significantly increased (SMD = 0.358, CI: 0.015; 0.701) and kynurenic acid (KA) significantly decreased (SMD = -0.260, CI: -0.487; -0.034) in severe MDD/BD.
Einfach gesagt: At least 13 studied genes with polymorphisms were involved in MDD development according to MF and BP, but not significantly.
Suktas A et al. · BMC psychiatry (2024)
A similar result was observed for BDNF rs6265 GG (OR = 1.26; 95% CI = 0.78-2.06; P = 0.35) and BDNF rs6265 AA genotypes (OR = 1.12; 95% CI = 0.77-1.64; P = 0.56).
At least 13 studied genes with polymorphisms were involved in MDD development according to MF and BP, but not significantly.
These results suggest that MDD development risk factors might require genetic and other factors for interaction and induction.
Einfach gesagt: The TRYCAT pathway appears to be downregulated in BD patients.
Hebbrecht K et al. · Frontiers in immunology (2021)
Spürbar Nutzen
← SchlechterKein EffektBesser →
Likely real
Peripheral levels of tryptophan (SMD = -0.44; p < 0.001), kynurenine (SMD = - 0.3; p = 0.001) and kynurenic acid (SMD = -.45; p = < 0.001) were lower in BD patients versus healthy controls.
The TRYCAT pathway appears to be downregulated in BD patients.
There is a need for more and high-quality studies of peripheral and central TRYCAT levels, preferably using longitudinal designs.
9Association between serotonin and depressionSystematische Übersichtn=17 · very small study2023
Einfach gesagt: This meta-analysis examined the effects of Tryptophan.
Moncrieff J et al. · Molecular psychiatry (2023)
The main areas of serotonin research provide no consistent evidence of there being an association between serotonin and depression, and no support for the hypothesis that depression is caused by lowered serotonin activity or concentrations.
Some evidence was consistent with the possibility that long-term antidepressant use reduces serotonin concentration.
Conclusions: Gut microbiota dysbiosis may contribute to anxiety vulnerability in perimenopausal women through interconnected immune, metabolic, and neuroendocrine mechanisms.
Dietary modulation of the intestinal microbiota represents a biologically plausible and low-risk complementary approach to support emotional well-being during this transitional period.
11Sleep and circadian disruption effects on microbiomeÜbersicht2026
Einfach gesagt: We highlight directions for future mechanistic research, particularly in translational models, to clarify causal pathways and support microbiome-informed strategies for mitigating the health consequences of sleep and circadian disruption.Published by Elsevier Ltd.
Maki KA et al. · Neuroscience and biobehavioral reviews (2026)
Across studies, consistent links emerged between sleep and circadian disruption and changes in host homeostasis through microbiome-mediated mechanisms.
These include activation of the hypothalamic-pituitary-adrenal axis, altered bile acid metabolism, inflammation-related microbial shifts, and disrupted tryptophan pathways.
Together, these findings suggest that altered sleep influences metabolic and immune function via gut microbial signaling pathways.
12Sleep quality improvementMeta-Analysen=28 · very small study2025
Einfach gesagt: Conclusions These findings suggest that tryptophan, vitamin D, omega-3, zinc, and antioxidants may enhance sleep quality by decreasing SL, and WASO increases SE and extends TST, respectively.
Mei M, Zhou Q, Gu W, Li F, Yang R, Lei H, Liu C. · Nutrients (2025)
Kein klarer Effekt
← SchlechterKein EffektBesser →
Borderline
NASO showed a marginal reduction (MD: -1.57, 95% CI: -3.16 to 0.02, p = 0.05).
Results This study, in total, included 28 randomized controlled trials.
Conclusions These findings suggest that tryptophan, vitamin D, omega-3, zinc, and antioxidants may enhance sleep quality by decreasing SL, and WASO increases SE and extends TST, respectively.
14Effectiveness of pharmacotherapy for sleep bruxismMeta-Analysen=16 · very small study2014
Einfach gesagt: There was insufficient evidence on the effectiveness of pharmacotherapy for the treatment of sleep bruxism.
Macedo CR et al. · The Cochrane database of systematic reviews (2014)
There was insufficient evidence on the effectiveness of pharmacotherapy for the treatment of sleep bruxism.
This systematic review points to the need for more, well-designed, RCTs with larger sample sizes and adequate methods of allocation, outcome assessment and duration of follow-up.
Ideally, parallel RCTs should be used in future studies to avoid the bias associated with cross-over studies.
Einfach gesagt: The goal for clinical research is to explore options for TRP-targeted therapies and their integration into new therapeutic strategies.
Holeček M · Nutrients (2026)
The final sections are devoted to the benefits and adverse effects of TRP supplementation, the therapeutic use of various TRP metabolites, and the pharmacological targeting of enzymes, transporters, and receptors involved in TRP catabolism.
It is concluded that all pathways of TRP catabolism are altered across a broad spectrum of human illnesses, and further investigation is needed to understand their role in disease pathogenesis better.
The goal for clinical research is to explore options for TRP-targeted therapies and their integration into new therapeutic strategies.
Einfach gesagt: The KP may play a key role in the pathophysiology of CS-associated behaviors, and could serve to highlight potential targets for novel therapeutic strategies, specifically for treatment resistance.
de Bartolomeis A, Fornaro M, Scopetta E, Ricci C, Irano A, De Simone G, Comai S, Iasevoli F, Caiazza C. · European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology (2025)
We performed a systematic review and meta-analysis following a pre-determined protocol (PROSPERO:CRD42023459414), considering KP metabolites and enzymes as outcomes (Standardized Mean Difference=SMD).
CS proved to increase hippocampal and cortical overall concentrations of kynurenine (SMD=1.71,95 %C.I.[0.99,2.42], p < 0.01,I 2 =91.3 %,k = 23,n = 508; SMD=1.54,95 %C.I.[1.08,2.01],p < 0.01,I 2 =57.77 %,k = 16,n = 247), as well as kynurenine/tryptophan ratio and quinolinic acid.
KP enzyme expression/activity, including Indoleamine-2,3-Dioxygenase, Tryptophan-2,3-Dioxygenase, Kynurenine-3-Monoxygenase, increased.
Einfach gesagt: This systematic-review examined the effects of Tryptophan.
Zhang Y et al. · Cell communication and signaling : CCS (2026)
Finally, we propose a conceptual "diet-microbiota-drug" triad to guide precision interventions, and discuss current challenges such as interindividual variability, the lack of standardized assessment tools, and the need for integrative multi‑omics and clinical validation.
A deeper mechanistic understanding of gut-organ crosstalk may pave the way for innovative therapies to restore systemic metabolic homeostasis.
Einfach gesagt: Broader application of this research could ultimately refine personalized psychiatry, expand therapeutic horizons, and contribute to global mental health resilience.
Chehadi AC et al. · International journal of molecular sciences (2026)
Special emphasis is placed on translational potential, methodological limitations, and the need for harmonized research frameworks.
Here we highlight that phytochemical interventions represent a mechanistically informed and biocompatible strategy for advancing depression management.
By bridging neurobiology and clinical psychiatry, these insights may pave the way for next-generation therapeutics that integrate dietary, microbiota-targeted, and anti-inflammatory approaches.
Einfach gesagt: However, these findings should be interpreted cautiously due to substantial heterogeneity and limited control for key confounders such as antipsychotic medication, diet, and life-style factors.
Militaru AM, Pietreanu AC, Trifu S, Popa GL. · International journal of molecular sciences (2026)
Meta-analyses revealed no statistically significant differences in alpha diversity indices (Shannon, Simpson, Chao1, ACE, Observed) between patients and controls, despite high heterogeneity.
Taxonomic synthesis identified recurrent but heterogeneous dysbiotic patterns characterized by the depletion of short-chain fatty acid-producing taxa (e.g., Faecalibacterium , Roseburia , Lachnospiraceae) and enrichment of pro-inflammatory taxa (e.g., Proteobacteria, Fusobacterium ).
Schizophrenia is associated with evidence of compositional alterations and functional shifts rather than a global loss of microbial richness.