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Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review

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Abstract

Background

Melatonin is a neurohormone secreted predominantly by the pineal gland that is demonstrated to be associated with the pathogenesis of multiple sclerosis (MS). This research desires to evaluate the tolerability and beneficial effects of exogenous melatonin supplementations in patients with MS.

Methods

This study was executed following the PRISMA 2020 statement. Both observational and interventional studies which reported the clinical effectiveness and/or safety of melatonin supplementation in patients with MS were included in this systematic review. Ovid, PubMed, Scopus, Embase, and Web of Science databases were searched and the risk of bias in included studies was assessed using the Joanna Briggs Institute (JBI) critical appraisal tools based on study design.

Results

Out of 1304 results of database searches, finally, 14 articles, including 7 randomized controlled trials (RCTs), 6 case–control studies, and one quasi-experimental study, were included based on the full-text review. Included phenotypes of MS were mostly relapsing-remitting MS (RRMS) (in 11 studies); it was secondary progressive MS (SPMS) in only one study, and two other studies had a mixture of the different phenotypes. The course of treatment with melatonin supplementation was between 2 weeks and 12 months. There were no substantial safety issues. Although melatonin was associated with enhanced oxidative stress and inflammation status, concerning the clinical benefits, limited studies suggested improvements in sleep conditions, cognitive outcomes, and fatigue in MS.

Discussion

There are insufficient data to support the regular melatonin prescription in MS. Limitations such as the small number of included studies, the diversity of the dosage, route, and duration of melatonin administration, and the diversity of assessment tests lead to unconvincing findings in this study. There is a need for future studies to achieve a comprehensive judgment on this subject.

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This published article and its supplementary files include all data generated or analyzed during this study.

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Acknowledgements

The research protocol was approved and supported by the Student Research Committee, Tabriz University of Medical Sciences (Grant Number: 70831).

Funding

The research protocol was approved and supported by the Student Research Committee, Tabriz University of Medical Sciences (Grant Number: 70831).

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Authors and Affiliations

Authors

Contributions

ZS, SM, JK, SH, ZH, EG-K, and AN: systematic search; study selection, data extraction, risk of bias assessment, preparing the figures and writing the first draft of the manuscript; SS and MT: supervision and critically editing the manuscript. All authors approved the final version for submission.

Corresponding authors

Correspondence to Mahnaz Talebi or Amirreza Naseri.

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Conflict of interest

The authors have not disclosed any competing interests.

Ethics approval

The ethics committee of Tabriz University of Medical Science reviewed and approved the study protocol (Ethics code: IR.TBZMED.VCR.REC.1401.293).

Consent for publication

Not applicable.

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Morsali, S., Sabahi, Z., Kakaei, J. et al. Clinical efficacy and safety of melatonin supplementation in multiple sclerosis: a systematic review. Inflammopharmacol 31, 2213–2220 (2023). https://doi.org/10.1007/s10787-023-01271-4

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  • DOI: https://doi.org/10.1007/s10787-023-01271-4

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