- Indexed in PubMed Central (PMC), ESCI, ProQuest, EBSCO, and the DOAJ
- Published since 2008
- Publication is subject to payment of an article processing charge (APC)
International Journal of Tryptophan Research is an open access, peer reviewed international 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 related precursors and metabolites such as serotonin, melatonin, niacin, tryptamine, kynurenine, and indoleamine 2,3-dioxygenase. Please see the Aims and Scope tab for further information.
This journal is a member of the Committee on Publication Ethics (COPE).
Submit your manuscript by following this link.
Please see the Submission Guidelines tab for more information on how to submit your article to the journal.
Open access article processing charge (APC) information
Publication in the journal is subject to payment of an article processing charge (APC). The APC serves to support the journal and ensures that articles are freely accessible online in perpetuity under a Creative Commons license.
The APC for this journal is currently $2650 USD.
The article processing charge (APC) is payable when a manuscript is accepted after peer review, before it is published. The APC is subject to taxes where applicable. Please see further details here.
Please direct any queries to Kristina.Moulton@sagepub.com
The International Journal of Tryptophan Research is an international, open access, peer reviewed journal which covers all subjects related to Tryptophan research. There is no suitable journal that focuses on Tryptophan, and the IJTR aims to fill this void and provide a forum for those with interests in this area.
This journal welcomes new manuscripts for peer review on the following topics:
- All articles related to Tryptophan research
- Related precursors and metabolites such as serotonin, melatonin, niacin, tryptamine, kynurenine, and indoleamine 2,3-dioxygenase
- Industrial production
- Supplementation and role in diet
- Neurological disorders
- Immune response
- Submit your manuscript by following this link.
- Please refer to the Submission Guidelines tab for more information before submitting your manuscript.
|Gilles Guillemin||Macquarie University, Australia|
|Benjamin Heng, PhD, FHEA||Macquarie Medical School, Macquarie University|
|Trevor Stone||University of Oxford, UK|
|Bruce James Brew||University of New South Wales, Australia|
|Nashat Abumaria||Tsinghua University, China|
|Abdulla Abu-Bakr Badawy||Cardiff Metropolitan University, UK|
|Maria Laura Belladonna||University of Perugia, Italy|
|Adriano Boasso||Chelsea and Westminster Hospital, UK|
|Stuart Jay Chaskes||Farmingdale State College of New York, USA|
|Gerard Clarke||University College Cork, Ireland|
|M. Mohamed Essa||Sultan Quaboos University, Oman|
|Francesca Fallarino||University of Perugia, Italy|
|Dietmar Fuchs||Innsbruck Medical University, Austria|
|David Gilot||University of Rennes 1, France|
|Xenia Gonda||Semmelweis University, Hungary|
|Ross Grant||University of New South Wales, Australia|
|Nicholas Hunt||University of Sydney, Australia|
|Jolanta Jaworek||Jagiellonian University CM, Poland|
|Michael Kirsch||University Hospital of Essen, Germany|
|Edwin Lim||Macquarie University, Australia|
|Yu Liu||Nankai University, China|
|David Lovejoy||Macquarie University, Australia|
|Eduard Maron||University of Tartu, Estonia|
|Sandeep Mittal||Wayne State University, USA|
|Ali A. Moosavi-Movahedi||University of Tehran, Iran|
|Francisco J. Morales||Spanish National Research Council, Spain|
|Flavio Moroni||University of Florence, Italy|
|Alexander J. Muller||Lankenau Institute for Medical Research, USA|
|Norbert Muller||Ludwig-Maximilians University Munich, Germany|
|David A. Nielsen||Baylor College of Medicine, USA|
|Yoshiji Ohta||Fujita Heath University School of Medicine, Japan|
|Sergio D. Paredes||Complutense University of Madrid, Spain|
|Robert S. Phillips||University of Georgia, USA|
|Michael Platten||University Hospital Heidelberg, German Cancer Research Center, Germany|
|Martin Reuter||University of Bonn, Germany|
|Ana Beatriz Rodriguez Moratinos||University of Extremadura, Spain|
|Kuniaki Saito||Department of Disease Control and Prevention, Fujita Health University, Japan|
|Robert Schwarcz||University of Maryland School of Medicine, USA|
|Trevor W. Stone||University of Glasgow, UK|
|Gayathri Sundaram||University of New South Wales, Australia|
|Vanessa Xiuwen Tan||Centre for MND Research, Macquarie University, Australia|
|Shane Thomas||University of New South Wales, Australia|
|Benoit Van den Eynde||Ludwig Institute for Cancer research, de Duve Institute, Université catholique de Louvain, Belgium|
|Laszlo Vecsei||University of Szeged, Hungary|
|David W. Walker||Monash Institute of Medical Research, Australia|
|Ernst R. Werner||Innsbruck Medical University, Austria|
|Florian Zepf||The University of Western Australia, Australia|
This Journal is a member of the Committee on Publication Ethics.
This Journal recommends that authors follow the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals formulated by the International Committee of Medical Journal Editors (ICMJE).
Please read the guidelines below then visit the journal’s submission site to upload your manuscript. Please note that manuscripts not conforming to these guidelines may be returned.
Only manuscripts of sufficient quality that meet the aims and scope of International Journal of Tryptophan Research will be reviewed.
As part of the submission process you will be required to warrant that you are submitting your original work, that you have the rights in the work, that you are submitting the work for first publication in the Journal and that it is not being considered for publication elsewhere and has not already been published elsewhere, and that you have obtained and can supply all necessary permissions for the reproduction of any copyright works not owned by you.
Please Read the Manuscript Submission Guidelines below before submitting your manuscript here:
- Open Access
- Article processing charge (APC)
- What do we publish?
3.1 Aims & scope
3.2 Article types
3.3 Writing your paper
- Editorial policies
4.1 Peer Review Policy
4.5 Declaration of conflicting interests
4.6 Research ethics and patient consent
4.7 Clinical Trials
4.8 Reporting guidelines
4.9 Research data
- Publishing policies
5.1 Publication ethics
5.2 Contributor's publishing agreement
- Preparing your manuscript
6.1 Word processing formats
6.2 Artwork, figures and other graphics
6.3 Supplemental material
6.4 Reference style
6.5 English language editing services
- Submitting your manuscript
7.1 How to submit your manuscript
7.2 Title, keywords and abstracts
7.3 Information required for completing your submission
7.5 Information required for completing your submission
- On acceptance and publication
8.1 Sage Production
8.2 Continuous publication
8.3 Promoting your article
- Further information
International Journal of Tryptophan Research is an open access, peer-reviewed journal. Each article
accepted by peer review is made freely available online immediately upon publication, is published
under a Creative Commons license and will be hosted online in perpetuity. Publication costs of the
journal are covered by the collection of article processing charges which are paid by the funder,
institution or author of each manuscript upon acceptance. There is no charge for submitting a paper to
If, after peer review, your manuscript is accepted for publication, a one-time article processing charge
(APC) is payable. This APC covers the cost of publication and ensures that your article will be freely
available online in perpetuity under a Creative Commons license.
The APC for this journal is $2650 USD.
*The article processing charge (APC) is payable upon acceptance after peer review and is subject to value
added tax (VAT) where applicable. If the paying author/institution is based in the European Union, to
comply with European law, VAT must be added to the APC. Providing a VAT registration number will
allow an institution to avoid paying this tax, except for UK institutions. Payments can be made in GBP or
Before submitting your manuscript to International Journal of Tryptophan Research, please
ensure you have read the Aims & Scope.
International Journal of Tryptophan Research welcomes submissions of the following types:
- Commentaries discuss the findings, implications, and/or outcomes of specific
research or wider research on a general topic. They elaborate on or offer original
ideas about a specific paper or a widely-researched subject. Commentaries
differ from reviews in that they present the author’s original ideas and
suggestions instead of only collating and reporting the previous research.
- Written 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
concerning the journal, or to introduce supplements, special issues, or new ideas
relevant to the journal. In limited circumstances individuals other than the
individuals listed here may propose an editorial topic if they wish.
3. Letters to the Editor
- Letters to the editor can be submitted on any topic relevant to the journal and
are usually in response to an article published in the journal. They can suggest
new subjects to be incorporated by the journal or commend and review papers
published in the journal. We recommend that individuals considering submitting
a letter to the editor should contact the editor in chief first to discuss their
manuscript. Authors should be aware that letters to the editor are not always
added to some databases/indexes. Where the editor in chief determines that a
letter to the editor does not require peer review a 50% discount on the journal’s
standard applicable article processing fee will apply. Otherwise the standard
article processing fee will apply, except if the letter addresses an issue on a
published paper typically addressed through an expression of concern or
retraction; in such cases no fee will apply.
4. Meeting reports
- This manuscript type reports on a meeting with specific relevance to the journal it is submitted to. Meetings can be international or national conferences or institutional seminars.
- Methodology manuscripts explain a new methodology or an improvement in existing methodologies in therapeutics techniques or medical procedures.
6. Original research
- These should detail original experiments/research conducted by the authors. Any research on any topic is accepted, provided it falls within the aims and scope of the journal. Original research must add to scientific knowledge on the subject and must be completed in accordance with ethical principles. Research on humans or animals must have applicable ethical approvals.
- Typically presenting an opinion based on practical experience, these manuscripts
are similar to opinion articles, but stem from personal experience of the subject
discussed. They can be written in response to other papers provided the author
has relevant experience.
- A review is a detailed examination including the benefits and drawbacks of a
medicine, therapeutic technique, computer program, policy, or anything else
appropriate to the journal. They are substantially composed of a report on
previous research. Authors wishing to present original ideas in addition should
choose the Commentary type. All journals accept unsolicited review
manuscripts for peer review.
9. Short reports
- Short reports present new research that adds to previous studies. This can be
reporting on the reliability or unreliability of research or informing readers of
new factors that may influence the outcome of the study. Authors must
acknowledge the work they build upon including any unpublished sources.
Manuscripts should be no longer than approximately 1,000 words excluding
10. Technical advances
- A broad-scoped category of manuscript reporting an advance within the journal's
scope. New procedures, experiments, standard practices, or computational
methods should be presented in technical advance articles. They report on
significant advancements in technology that the reader will benefit from learning
The Sage Author Gateway has some general advice and on how to get published, plus links to
3.3.1 Making your article discoverable
When writing up your paper, think about how you can make it discoverable. The title,
keywords and abstract are key to ensuring readers find your article through search
engines such as Google. For information and guidance on how best to title your article,
write your abstract and select your keywords, have a look at this page on the Gateway:
How to Help Readers Find Your Article Online
The journal’s policy is to have manuscripts reviewed by two expert reviewers. International
Journal of Tryptophan Research utilizes a single-anonymize peer review process in which the
reviewer’s name and information is withheld from the author. All manuscripts are reviewed as
rapidly as possible, while maintaining rigor. Reviewers make comments to the author and
recommendations to the Editor-in-Chief who then makes the final decision.
The Editor or members of the Editorial Board may occasionally submit their own manuscripts for
possible publication in the journal. In these cases, the peer review process will be managed by
alternative members of the Board and the submitting Editor / Board member will have no
involvement in the decision-making process.
International Journal of Tryptophan Research is committed to delivering high quality, fast peerreview
for your paper, and as such has partnered with Publons. Publons is a third party service
that seeks to track, verify and give credit for peer review. Reviewers for International Journal of
Tryptophan Research can opt in to Publons in order to claim their reviews or have them
automatically verified and added to their reviewer profile. Reviewers claiming credit for their
review will be associated with the relevant journal, but the article name, reviewer’s decision and
the content of their review is not published on the site. For more information visit the Publons
Papers should only be submitted for consideration once consent is given by all contributing
authors. Those submitting papers should carefully check that all those whose work contributed
to the paper are acknowledged as contributing authors.
The list of authors should include all those who can legitimately claim authorship. This is all
(i) Made a substantial contribution to the concept or design of the work; or acquisition,
analysis or interpretation of data,
(ii) Drafted the article or revised it critically for important intellectual content,
(iii) Approved the version to be published,
(iv) Each author should have participated sufficiently in the work to take public
responsibility for appropriate portions of the content.
Authors should meet the conditions of all of the points above. Each author should have
participated sufficiently in the work to take public responsibility for appropriate portions of the
When a large, multicentre group has conducted the work, the group should identify the
individuals who accept direct responsibility for the manuscript. These individuals should fully
meet the criteria for authorship.
Acquisition of funding, collection of data, or general supervision of the research group alone
does not constitute authorship, although all contributors who do not meet the criteria for
authorship should be listed in the Acknowledgments section. Please refer to the International
Committee of Medical Journal Editors (ICMJE) authorship guidelines for more information on
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.
All contributors who do not meet the criteria for authorship should be listed in an
Acknowledgements section. Examples of those who might be acknowledged include a person
who provided purely technical help, or a department chair who provided only general support.
4.3.1 Writing assistance
Individuals who provided writing assistance, e.g. from a specialist communications company, do
not qualify as authors and so should be included in the Acknowledgements section. Authors
must disclose any writing assistance –including the individual’s name, company and level of
input – and identify the entity that paid for this assistance.
It is not necessary to disclose use of language polishing services.
Any acknowledgements should appear first at the end of your article prior to your Declaration of
Conflicting Interests (if applicable), any notes and your References.
International Journal of Tryptophan Research requires all authors to acknowledge their funding
in a consistent fashion under a separate heading. Please visit the Funding Acknowledgements
page on the Sage Journal Author Gateway to confirm the format of the acknowledgment text in
the event of funding, or state that: This research received no specific grant from any funding
agency in the public, commercial, or not-for-profit sectors.
It is the policy of International Journal of Tryptophan Research to require a declaration of
conflicting interests from all authors enabling a statement to be carried within the paginated
pages of all published articles.
Please ensure that a ‘Declaration of Conflicting Interests’ statement is included at the end of
your manuscript, after any acknowledgements and prior to the references. If no conflict exists,
please state that ‘The Author(s) declare(s) that there is no conflict of interest’.
For guidance on conflict of interest statements, please see the ICMJE recommendations.
Medical research involving human subjects must be conducted according to the World Medical
Association Declaration of Helsinki.
Submitted manuscripts should conform to the ICMJE Recommendations for the Conduct,
Reporting, Editing, and Publication of Scholarly Work in Medical Journals, and all papers
reporting animal and/or human studies must state in the methods section that the relevant
Ethics Committee or Institutional Review Board provided (or waived) approval. Please ensure
that you have provided the full name and institution of the review committee, in addition to the
For research articles, authors are also required to state in the methods section whether
participants provided informed consent and whether the consent was written or verbal.
Information on informed consent to report individual cases or case series should be included in
the manuscript text. A statement is required regarding whether written informed consent for
patient information and images to be published was provided by the patient(s) or a legally
authorized representative. Please do not submit the patient’s actual written informed consent
with your article, as this in itself breaches the patient’s confidentiality. The Journal requests that
you confirm to us, in writing, that you have obtained written informed consent but the written
consent itself should be held by the authors/investigators themselves, for example in a patient’s
hospital record. The confirmatory letter may be uploaded with your submission as a separate file.
Please also refer to the ICMJE Recommendations for the Protection of Research Participants
All research involving animals submitted for publication must be approved by an ethics committee with oversight of the facility in which the studies were conducted. The Journal has adopted the ARRIVE guidelines.
International Journal of Tryptophan Research conforms to the ICMJE requirement that clinical
trials are registered in a WHO-approved public trials registry at or before the time of first patient
enrolment 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.
The relevant EQUATOR Network reporting guidelines should be followed depending on the type
of study. For example, all randomized controlled trials submitted for publication should include
a completed CONSORT flow chart as a cited figure and the completed CONSORT checklist should
be uploaded with your submission as a supplementary file. Systematic reviews and metaanalyses
should include the completed PRISMA flow chart as a cited figure and the completed
PRISMA checklist should be uploaded with your submission as a supplementary file. The
EQUATOR wizard can help you identify the appropriate guideline.
Other resources can be found at NLM’s Research Reporting Guidelines and Initiatives.
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 availability statement linking to your data. If it is not possible to share your data, we encourage you to consider using the statement to explain why it cannot be shared.
- cite this data in your research
Sage is committed to upholding the integrity of the academic record. We encourage authors to
refer to the Committee on Publication Ethics’ International Standards for Authors and view the
Publication Ethics page on the Sage Author Gateway.
International Journal of Tryptophan Research and Sage take issues of copyright infringement,
plagiarism or other breaches of best practice in publication very seriously. We seek to protect
the rights of our authors and we always investigate claims of plagiarism or misuse of published
articles. Equally, we seek to protect the reputation of the journal against malpractice. Submitted
articles may be checked with duplication-checking software. Where an article, for example, is
found to have plagiarized other work or included third-party copyright material without
permission or with insufficient acknowledgement, or where the authorship of the article is
contested, we reserve the right to take action including, but not limited to: publishing an
erratum or corrigendum (correction); retracting the article; taking up the matter with the head
of department or dean of the author's institution and/or relevant academic bodies or societies;
or taking appropriate legal action.
5.1.2 Prior publication
If material has been previously published, it is not generally acceptable for publication in a Sage
journal. However, there are certain circumstances where previously published material can be
considered for publication. Please refer to the guidance on the Sage Author Gateway or if in
doubt, contact the Editor at the address given below.
Before publication Sage requires the author as the rights holder to sign a Journal Contributor’s
Publishing Agreement. International Journalof Tryptophan Research publishes manuscripts
under Creative Commons licenses. The standard license for the journal is Creative Commons by
Attribution Non-Commercial (CC BY-NC), which allows others to re-use the work without
permission as long as the work is properly referenced and the use is non-commercial. For more
information, you are advised to visit Sage's OA licenses page.
Alternative license arrangements are available, for example, to meet particular funder
mandates, made at the author’s request.
The preferred format for your manuscript is Word. LaTeX files are also accepted. Word and
(La)Tex templates are available on the Manuscript Submission Guidelines page of our Author
For guidance on the preparation of illustrations, pictures and graphs in electronic format, please
visit Sage’s Manuscript Submission Guidelines
Figures supplied in color will appear in color online.
This journal is able to host additional materials online (e.g. datasets, podcasts, videos, images
etc) alongside the full-text of the article. These will be subjected to peer-review alongside the
article. For more information please refer to our guidelines on submitting supplementary files,
which can be found within our Manuscript Submission Guidelines page.
Authors seeking assistance with English language editing, translation, or figure and manuscript
formatting to fit the journal’s specifications should consider using Sage Language Services. Visit
Sage Language Services on our Journal Author Gateway for further information.
Please supply a title, short title, an abstract and keywords to accompany your article. The title,
keywords and abstract are key to ensuring readers find your article online through online search
engines such as Google. Please refer to the information and guidance on how best to title your
article, write your abstract and select your keywords by visiting the Sage Journal Author
Gateway for guidelines on How to Help Readers Find Your Article Online.
Provide full contact details for the corresponding author including email, mailing address and
telephone numbers. Academic affiliations are required for all co-authors. These details should
be presented separately to the main text of the article to facilitate anonymous peer review.
You will be asked to provide contact details and academic affiliations for all co-authors via the
submission system and identify who is to be the corresponding author. These details must
match what appears on your manuscript. At this stage please ensure you have included all the
required statements and declarations and uploaded any additional supplementary files
(including reporting guidelines where relevant).
As part of our commitment to ensuring an ethical, transparent and fair peer review process Sage
is a supporting member of ORCID, the Open Researcher and Contributor ID. ORCID provides a
unique and persistent digital identifier that distinguishes researchers from every other researcher,
even those who share the same name, and, through integration in key research workflows such as
manuscript and grant submission, supports automated linkages between researchers and their
professional activities, ensuring that their work is recognized.
The collection of ORCID IDs from corresponding authors is now part of the submission process of this
journal. If you already have an ORCID iD you will be asked to associate that to your submission during
the online submission process. We also strongly encourage all co-authors to link their ORCID ID to their
accounts in our online peer review platforms. It takes seconds to do: click the link when prompted, sign
into your ORCID account and our systems are automatically updated. Your ORCID iD will become part
of your accepted publication’s metadata, making your work attributable to you and only you. Your ORCID
iD is published with your article so that fellow researchers reading your work can link to your ORCID
profile and from there link to your other publications.
You will be asked to provide contact details and academic affiliations for all co-authors via the submission
system and identify who is to be the corresponding author. These details must match what appears on your
manuscript. The affiliation listed on the manuscript should be the institution where the research was
conducted. If an author has moved to a new institution since completing the research, the new affiliation can
be included in a manuscript note at the end of the paper. At this stage please ensure you have included all
the required statements and declarations and uploaded any additional supplementary files (including
reporting guidelines where relevant).
Authors are responsible for obtaining permission from copyright holders for reproducing any
illustrations, tables, figures or lengthy quotations previously published elsewhere. For further
information including guidance on fair dealing for criticism and review, please visit our
Frequently Asked Questions on the Sage Journal Author Gateway.
If your paper is accepted for publication after peer review, you will first be asked to complete the
contributor’s publishing agreement. Once your manuscript files have been checked for Sage Production,
the corresponding author will be asked to pay the article processing charge (APC) via a payment link.
Once the APC has been processed, your article will be prepared for publication and can appear online
within an average of 30 days. Please note that no production work will occur on your paper until the
APC has been received.
Your Sage Production Editor will keep you informed as to your article’s progress throughout the
production process. Proofs will made available to the corresponding author via our editing portal
Sage Edit, or by email to the corresponding author and should be returned promptly. Authors are
reminded to check their proofs carefully to confirm that all author information, including names,
affiliations, sequence and contact details are correct, and that Funding and Conflict of Interest
statements, if any, are accurate.
One of the many benefits of publishing your research in an open access journal is the speed to
publication. With no page count constraints, your article will be published online in a fully
citable form with a DOI number as soon as it has completed the production process. At this time
it will be completely free to view and download for all.
Publication is not the end of the process! You can help disseminate your paper and ensure it is as widely read and cited as possible. The Sage Author Gateway has numerous resources to help you promote your work. Visit the Promote Your Article page on the Gateway for tips and advice.
Any correspondence, queries or additional requests for information on the Manuscript Submission
process should be sent to the International Journal of Tryptophan Research editorial office as follows:
Samantha Crown | Samantha.Crown@sagepub.com