Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study
- DOI
- 10.3389/fnut.2025.1751673
- Published
- 2026-01-26
- Container
- Frontiers in Nutrition
- Publisher
- Frontiers Media SA
- Open access
- unknown
Credibility signals
uncertain Score 64/100 under policy 1.0.0. This is a metadata assessment, not a judgment of the paper's conclusions.
Show all credibility signals
- supportingDOI registered: A matching record was returned by Crossref.
- supportingDOI resolves: A matching record was returned by Crossref.
- not scoredDirectory of Open Access Journals: No matching DOAJ record was present in this response. No allow-list match; this is not evidence of low credibility.
- not scoredMEDLINE indexed: Not checked or no result supplied; no credibility inference made.
- not scoredOpenAlex core source: Not checked or no result supplied; no credibility inference made.
- not scoredKnown publisher allow-list: Not checked or no result supplied; no credibility inference made.
- not scoredROR affiliation: Not checked or no result supplied; no credibility inference made.
- not scoredRetraction Watch retraction: No retraction notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete.
- not scoredRetraction Watch expression of concern: No expression of concern notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete.
- not scoredRetraction Watch correction: No correction notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete.
- not scoredRetraction Watch reinstatement: No reinstatement notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete.
- not scoredOpen access status: Not checked or no result supplied; no credibility inference made.
- not scoredPublication license: Not checked or no result supplied; no credibility inference made.
- not scoredPublication version: A publication version was supplied but is not scored.
- supportingMetadata completeness: All 6 scored descriptive metadata groups are present.
Cite this work
BibTeX
@article{allodium:10.3389/fnut.2025.1751673,
title = {Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study},
author = {Selin Yildirim Tuncer and Serhat Ozdenk and Ulas Can Yildirim and Dilara Erkan and Cengizhan Sari and Mehmet Can Gundem and Halit Sar and Busra Yilmaz and Izzet Karakulak and Firat Akca},
year = {2026},
journal = {Frontiers in Nutrition},
doi = {10.3389/fnut.2025.1751673},
url = {https://doi.org/10.3389/fnut.2025.1751673}
}RIS
TY - JOUR TI - Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study AU - Selin Yildirim Tuncer AU - Serhat Ozdenk AU - Ulas Can Yildirim AU - Dilara Erkan AU - Cengizhan Sari AU - Mehmet Can Gundem AU - Halit Sar AU - Busra Yilmaz AU - Izzet Karakulak AU - Firat Akca PY - 2026 JO - Frontiers in Nutrition DO - 10.3389/fnut.2025.1751673 UR - https://doi.org/10.3389/fnut.2025.1751673 ER -
APA
Tuncer, S. Y., Ozdenk, S., Yildirim, U. C., Erkan, D., Sari, C., Gundem, M. C., Sar, H., Yilmaz, B., Karakulak, I., & Akca, F. (2026). Acute effects of combined and isolated caffeine and theanine supplementation on physical and cognitive performance in competitive athletes: a randomized, double-blind, placebo-controlled crossover study. Frontiers in Nutrition. https://doi.org/10.3389/fnut.2025.1751673
Source records
- crossref · retrieved 2026-09-27T08:46:35.328Z