Wir verwenden standardmäßig essenzielle Cookies (Anmeldung, deine gespeicherten Ziele/Stacks). Mit deiner Erlaubnis aktivieren wir außerdem datenschutzfreundliche Analytik (Vercel Web Analytics, anonyme Ladezeit-Metriken) und Fehler-Replay-Diagnostik (Sentry — DOM-Snapshots nur, wenn ein Fehler auftritt), damit wir Bugs schneller beheben können. Mehr über Cookies erfahren
Tr5.5
Tryptophan – Forschung
Hilft wahrscheinlich
72 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 1982–2026 mit einer typischen Studiengröße von 70 Teilnehmenden.
Basierend auf 72 Studien · 15 Meta-Analysen · 14 RCTs · 30,655 Teilnehmende insgesamt
Konfidenz
Hohe Konfidenz
Was die Studien gefunden haben
5geholfen2unklar· 65 weitere ohne bewertete Effektdaten
Nach Outcome
Depression & moodVerbesserte Stimmung durch Serotonin-Unterstützung · 1-2 weeks
Hilft vermutlich51 Studien
Therapeutic & clinical
Hilft wahrscheinlich24 Studien
Inflammation
Überwiegend Mechanismus / Beobachtung18 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 vermutlich11 Studien
Anxiety & stressSerotonin-Vorläufer reduziert Angst bei Personen mit Tryptophan-Depletion · 2-4 weeks
Überwiegend Mechanismus / Beobachtung5 Studien
Cognitive function
Überwiegend Mechanismus / Beobachtung4 Studien
Weight management
Überwiegend Mechanismus / Beobachtung4 Studien
Safety profile
Überwiegend Mechanismus / Beobachtung4 Studien
Women's health
Überwiegend Mechanismus / Beobachtung3 Studien
Glucose & metabolic
Zu wenige bewertete Studien1 Studie
Energy & fatigue
Zu wenige bewertete Studien1 Studie
Endurance & exercise performance
Zu wenige bewertete Studien1 Studie
Heart & blood pressure
Zu wenige bewertete Studien1 Studie
In Zahlen
Aus 43 Studien mit messbaren Effekten gezogen
Wahrscheinlich echte Effekte
50%
über Studien hinweg
Untersuchte Personen
31k
typische Studie: 70 Personen
Stärkste Designs
29
15 gepoolt, 14 randomisiert
Zeigte Nutzen
71%
5/7 Studien
Wie lange Studien liefen
1–4 Wochen
1
1–3 Monate
2
Untersuchte Populationen
General population3
Adults with depressive disorders1
Patients with major depressive disorder with melancholic and psychotic features1
Osteoarthritis patients1
Aktives Forschungsgebiet
64 Studien in den letzten 5 Jahren · Neueste Meta-Analyse: 2026
198220042026
1Meta-Analysen=1,938 · large study2026
Conclusions: Egg-derived protein supplementation provides clinical benefits in dialysis patients with hypoalbuminemia, but evidence is lacking supporting its routine use in healthy adults or other clinical populations.
Gong EJ, Bang CS, Lee JJ, Shin YS. · Nutrients (2026)
In dialysis patients, egg white supplementation significantly increased serum albumin (MD: +0.42 g/dL [95% CI: 0.12-0.72]; I 2 = 82.4%; four RCTs; GRADE: very low) and decreased serum phosphorus (MD: -2.04 mg/dL [-2.50, -1.58]; I 2 = 22%; two RCTs; GRADE: low).
Lactic-fermented egg white peptide reduced the visceral fat area (MD: -11.6 cm 2 [-18.5, -4.8]; two RCTs; GRADE: very low).
NWT-03 egg protein hydrolysate showed no significant effect on blood pressure (MD: +0.5 mmHg [-1.8, +2.7]; two RCTs).
2Depressive disorder symptomsMeta-AnalyseCited 1×n=17,437 · very large study2025
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.
3Tryptophan and metabolite levels in severe depressionMeta-AnalyseCited 23×n=4,647 · very large study2022
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.
4Differential metabolites identificationMeta-AnalyseCited 13×n=495 · medium study2023
The main differential metabolites between OA and healthy subjects were amino acids and their derivatives, including tryptophan, lysine, leucine, proline, phenylalanine, glutamine, dimethylglycine, citrulline, asparagine, acetylcarnitine and creatinine, which could be potential biomarkers for predicting OA.
Liao Z et al. · Nutrients (2023)
In the 13 studies, 132 kinds of small molecule differential metabolites were extracted, 58 increased, 57 decreased and 17 had direction conflicts.
Among them, 37 metabolites appeared more than twice.
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.
6Mood and emotional functioning improvementSystematische ÜbersichtCited 44×2021
In order to estimate the optimum amount of TRP intake more accurately, further studies need to be conducted with more appropriate settings of intake period, intake frequency, and intake method.
Kikuchi AM et al. · Journal of dietary supplements (2021)
This suggests that TRP intake may be an effective approach to decrease anxiety and increase positive mood in healthy individuals.
On the other hand, the effectiveness of TRP for aggressive feelings was not recognized.
Reviewing these 11 RCTs, we concluded that taking 0.14-3 g of TRP per day in addition to the usual meal can be expected to improve the mood of healthy individuals.
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.
8Association between serotonin and depressionSystematische ÜbersichtCited 496×n=17 · very small study2023
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.
In addition to the roles of the KP in the pathogenesis of the abovementioned diseases, the related advancements in treatment are discussed.
Zhang Q et al. · Reviews in the neurosciences (2026)
The kynurenine pathway (KP), a crucial route of tryptophan (TRP) catabolism, has emerged as a focal point of investigation because of its complex involvement in regulating central nervous system (CNS) function.
This metabolic pathway, which operates in various cell types within the CNS, closely links immune responses, neurotransmission, and neuroinflammation.
In addition to the roles of the KP in the pathogenesis of the abovementioned diseases, the related advancements in treatment are discussed.
Exploring the mechanisms linking tryptophan metabolism to embryo implantation and decidualization may pave the way for novel treatments for reproductive disorders.
Liu Z et al. · Tissue & cell (2026)
New evidence supports a close relationship between tryptophan metabolism and embryo implantation; the levels or ratios of tryptophan metabolites, such as kynurenine, serotonin, and melatonin, significantly correlate with various decidualization markers.
In this review, we summarize the latest research progress on tryptophan and its metabolites in embryo implantation and their effects on decidualization.
Exploring the mechanisms linking tryptophan metabolism to embryo implantation and decidualization may pave the way for novel treatments for reproductive disorders.
The "paradox" is therefore not that Trp changes chemistry across settings, but that the same nutrient is routed through different cellular contexts, enzymes, ligands, and cell states.
Cho A et al. · International journal of molecular sciences (2026)
We also argue that the potential metabolite biomarker interpretation should be context-dependent.
Finally, we propose a clinical-context-specific framework for intervention.
Dietary and microbiome-based strategies may be most effective in prevention, premalignant states, or supportive care, whereas established cancers are more likely to require biomarker-guided targeting of tumor-associated catabolic pathways and convergent signaling mechanisms.
Overall, these composites signify a promising type of material for next-generation electrochemical sensors in environmental analysis and clinical diagnostics.
Saravanakumar V, Vijayaprabhakaran A, Krishnan M, Kathiresan M, Suryanarayanan V, Kundu S. · Advances in colloid and interface science (2026)
In addition, a relative evaluation with conventional materials exists to highlight their advantages in sensitivity, selectivity, and stability.
Despite these advances, challenges such as large-scale synthesis, oxidation of MXenes, and long-term durability remain.
Pointing out these limitations is essential for the practical execution of MOF/MXene-based sensing platforms.
Trial registration PROSPERO number CRD42024510170.
Ben Fredj S, Kechiche H, Chouchen A, Akkari I, Ghammam R, Zammit N, Douss N, Skhiri A, Maoua M, Maatoug J, Harrabi I, Maalel OE. · BMC psychology (2026)
Probiotic consumption had a modest yet statistically significant positive effect on subclinical psychological outcomes, including symptoms of depression, anxiety, and stress, in healthy working adults (standardised mean difference (SMD) = -0.21, 95% CI [-0.34, -0.09], p = 0.001).
Moreover, the probiotic interventions were associated with a statistically significant reduction in cortisol levels, a key biomarker of physiological stress (SMD = -0.26, 95% confidence interval [CI] [-0.45, -0.08], p = 0.005).
Conversely, no statistically significant effects were observed for probiotic supplementation on the C-reactive protein levels, a marker of systemic inflammation.
Future studies integrating temporal profiling, spatial and cell-specific approaches, large-animal models, and pathway-informed clinical trials will be essential to define causal mechanisms and enable precision therapeutic translation.
Hussain S et al. · International journal of molecular sciences (2026)
This review synthesizes current evidence using a branch-specific and context-dependent framework.
We discuss the utility and limitations of the kynurenine-to-tryptophan ratio (KTR) as an upstream biomarker, the need for downstream metabolite panels, and therapeutic opportunities aimed at pathway modulation rather than broad inhibition.
Future studies integrating temporal profiling, spatial and cell-specific approaches, large-animal models, and pathway-informed clinical trials will be essential to define causal mechanisms and enable precision therapeutic translation.
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.
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.