Journal profile · NEUROSCIENCES
International Journal of Tryptophan Research
ISSN 1178-6469 · SAGE Publishing · United Kingdom
International Journal of Tryptophan Research: CAS Zone 4 · Medicine (2025 upgraded edition); impact factor 4.9 (journal website); fully open access; APC about USD 4,400; median 195 days to acceptance (24 articles, last 24 months); acceptance rate 76.2% (journal website); 7 articles in 2025; indexed in ESCI and Scopus.
Scope
Aims, scope and focus
International Journal of Tryptophan Research is published by SAGE Publishing and is in Zone 4 of Medicine in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Tryptophan and brain disorders, Stress Responses and Cortisol and Gut microbiota and health, together about 62.1% of its articles. (generated from OpenAlex topic counts and CAS ranking data)
International Journal of Tryptophan Research is an international, peer reviewed journal that focuses on all subjects related to tryptophan research, including isolation, functionality, interactions, analysis, synthesis and industrial production, as well as supplementation and role in diet, physiology, neurological disorders and immune response. Also of interest to the journal are … | View full journal description This journal is a member of the Committee on Publication Ethics (COPE).
From the journal's Aims & Scope
Research area (LetPub): NEUROSCIENCES
Editor-in-chief Benjamin HengPublisher website
Editorial board by country: none in mainland China; most named Germany 4, Italy 2, United Kingdom 1, Japan 1, France 1 (10 members with a country) Editorial board ↗Publisher website ·
Main research topics OpenAlex counts of recent articles; shares are approximate
- Tryptophan and brain disordersNeuroscience37.2%
- Stress Responses and CortisolNeuroscience16.7%
- Gut microbiota and healthBiochemistry, Genetics and Molecular Biology8.2%
- Bipolar Disorder and TreatmentMedicine6.4%
- Diet and metabolism studiesMedicine3.1%
- Neurotransmitter Receptor Influence on BehaviorNeuroscience2.4%
- Circadian rhythm and melatoninNeuroscience2.4%
- Neuroinflammation and Neurodegeneration MechanismsNeuroscience2.2%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Medicine Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Medicine | Zone 4 |
| Minor | Neurosciences | Zone 4 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Medicine Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Medicine | Zone 3 |
| Minor | Neurosciences | Zone 3 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Not covered
Not covered by this edition.
Database indexing
ESCIScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor (publisher)
- 4.9Publisher website ·
- 5-year impact factor (publisher)
- 5Publisher website ·
- CiteScore 2026-06
- 7.8LetPub ·
- SJR 2026-06
- 1.13LetPub ·
- SNIP 2026-06
- 0.98LetPub ·
- h-index
- 42OpenAlex ·
- i10-index
- 139OpenAlex ·
- 2-year mean citedness
- 3.46OpenAlex ·
- Self-citation rate
- 0%LetPub ·
- Share of gold OA articles
- 100%LetPub ·
Volume
- Articles per year
- 7LetPub ·
- Articles per year (publisher)
- 3Publisher website ·
Articles by year OpenAlex count · 215 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 18 | 18 | 7 |
| 2025 | 7 | 7 | 12 |
| 2024 | 12 | 12 | 109 |
| 2023 | 10 | 10 | 183 |
| 2022 | 21 | 21 | 335 |
| 2021 | 10 | 10 | 131 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
Review time from article dates manuscript dates registered with PubMed · to
195 daysMedian, submission to acceptance · P25–P75 120 days – 240 days
- Acceptance to online
- median 34 days (24 articles)
- Submission to online
- median 232 days
- Sample
- 24 articles with submission and acceptance dates (27 in the window); the latest was accepted on
Only articles that were accepted and published are counted, not the time spent on rejected manuscripts, so this usually runs longer than a publisher's "time to first decision".
Other sources
- Average review time (community reports)
- about 8 weeksLetPub ·
- Acceptance rate (publisher)
- 76.2%Publisher website ·
- Submission to first decision
- 10 daysPublisher website ·
- First decision after review
- 60 daysPublisher website ·
- Submission to acceptance
- 206 daysPublisher website ·
- Acceptance to publication
- 35 daysPublisher website ·
- Peer review
- Anonymous peer reviewLetPub
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Fully open accessOpenAlex
Every article is open access; authors usually pay an article processing charge (APC).
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| OpenAlex | USD 4,400 / GBP 3,226 | — | — | |
| LetPub | USD 2,650 | Yes | — | |
| Publisher website | Yes, amount not published | — | — |
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
Article types accepted12
- commentariesCommentaries discuss the findings, implications, and/or outcomes of specific research or wider research on a general topic.Length not stated
- commentaryInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- editorialInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- editorialsWritten by the Editor-in-Chief, deputy Editor-in-Chief, Guest Editor or Associate Editor of a journal, editorials are intended to inform readers of changes conc…Length not stated
- letterInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- letter to the editorInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- letters to the editorInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- meeting reportsThis manuscript type reports on a meeting with specific relevance to the journal it is submitted to.Length not stated
- methodologiesMethodology manuscripts explain a new methodology or an improvement in existing methodologies in therapeutics techniques or medical procedures.Length not stated
- original researchInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- reviewInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
- standard articleInternational Journal of Tryptophan Research welcomes submissions of the following types: CommentariesCommentaries discuss the findings, implications, and/or ou…Length not stated
Policy excerpts from the journal's websiteAuthorship, Data availability, Publication ethics, Open access, Peer review, Plagiarism, Preprints, Trial registration / reporting guidelines
- Authorship Authorship
Please view our authorship policies, which includes information on criteria for authorship, who should be the corresponding author and more. Please note that AI chatbots, for example ChatGPT, should not be listed as authors. For more information see the policy on Use of ChatGPT and generative AI tools.
Source ↗Publisher website ·- Data availability Data availability
The Journal is committed to facilitating openness, transparency and reproducibility of research, and has the following research data sharing policy. For more information, including FAQs please visit the Sage Research Data policy pages. Subject to appropriate ethical and legal considerations, authors are encouraged to: Share your research data in a relevant public data repository Include a data ava…
Source ↗Publisher website ·- Publication ethics Ethical considerations
Please include your ethics approval statements under this heading, even if you have already included ethics approval information in your methods section. If ethical approval was not required, you need to explicitly state this. All papers reporting studies involving human participants, human data or human tissue must state that the relevant Ethics Committee or Institutional Review Board approved th…
Source ↗Publisher website ·- Open access Publishing fees and open access
There are no fees payable to submit or publish in this journal. Figures submitted in color will be published in color in the online version of the journal at no cost. If you wish to have color figures in the printed version, you will receive information regarding costs from Sage after receipt of your accepted article. Optional open access publishing is available for a fee via the Sage Choice progr…
Source ↗Publisher website ·- Peer review Peer review policy
Peer review policy Model summary
The following summary describes the peer review process for this journal: Identity transparency: Single-anonymized Reviewer interacts with: Editor Review information published: None Your manuscript will undergo an initial evaluation. If it does not conform to the requirements laid out in these guidelines, it will be returned to you for amendments prior to peer review. Manuscripts may be desk rejec…
Source ↗Publisher website ·- Plagiarism Plagiarism
The journal and Sage take issues of copyright infringement, plagiarism or other breaches of best practice in publication very seriously. Please read Sage's complete policy on plagiarism and the actions we may take.
Source ↗Publisher website ·- Preprints Preprints
The journal will consider submissions of manuscripts that have been posted on preprint servers. Please enter the preprint DOI in the designated field when submitting your manuscript. We advise that you inform the Journal Editorial office about your posted preprint at submission. Note that you should not post an updated version of your manuscript on a preprint server while it is being peer reviewed…
Source ↗Publisher website ·- Trial registration / reporting guidelines Clinical trial registration
The journal conforms to the ICMJE requirement that clinical trials are registered in a WHO-approved public trials registry at or before the time of first participant enrollment as a condition of consideration for publication. The trial registry name and URL, and registration number must be included at the end of the abstract.
Source ↗Publisher website ·
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- SAGE Publishing
- Country or region
- United Kingdom
- Language
- English
- ISSN
- 1178-6469
- Official links
- Journal homepage ↗LetPub
- Submission system ↗Publisher website
- Author guidelines ↗LetPub
- Aims & Scope ↗LetPub
- Special issues ↗Publisher website
- Peer review process ↗LetPub
- Editorial board ↗LetPub
FAQ
Frequently asked questions about International Journal of Tryptophan Research
What CAS zone is International Journal of Tryptophan Research in?
In the 2025 upgraded edition of the CAS Journal Ranking, International Journal of Tryptophan Research is in Zone 4 of Medicine, and in Zone 4 of the minor category Neurosciences. In the 2026 Xinrui edition it is in Zone 3 of Medicine. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of International Journal of Tryptophan Research?
The journal's website gives an impact factor of 4.9; this is the journal's own figure, as LetPub lists none for it; CiteScore 7.8, h-index 42.
How long does peer review take at International Journal of Tryptophan Research?
Based on the dates recorded on 24 articles published between October 2024 and October 2026 (the last 24 months), the median time from submission to acceptance is 195 days (interquartile range 120–240 days); authors report an average review time of about 8 weeks; the journal's website gives an acceptance rate of 76.2%. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
Where are the editorial board members of International Journal of Tryptophan Research based?
Of the 10 board members whose country the journal's board page names, none are in mainland China; the countries named most often are Germany (4), Italy (2) and United Kingdom (1). Counted from the institutions listed on the board page; for reference only.
Which databases index International Journal of Tryptophan Research?
According to LetPub and DOAJ records, International Journal of Tryptophan Research is indexed in ESCI and Scopus.
Is International Journal of Tryptophan Research open access, and what is the APC?
International Journal of Tryptophan Research is a fully open-access journal. APC about USD 4,400.
Sources and updates
The facts on this page come from LetPub, Publisher website, OpenAlex; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-26). Last updated: .