Effects of 21-day vitamin D supplementation on sports performance and exercise-induced inflammation: a randomized double-blind trial.

Grześkiewicz K, Brzezińska P, Borkowska A, Kochanowicz A, Stankiewicz B, Piskorska E, Waldziński T, Bartík P, Antosiewicz J, Mieszkowski J

Open source

DOI: 10.3389/fphys.2026.1867500
Published: 2026
Container: Frontiers in physiology
Publisher: Not recorded
Open access: yes

Credibility signals

limited evidence Score 45/100 under policy 1.0.0. This is a metadata assessment, not a judgment of the paper's conclusions.

Show all credibility signals

cautionDOI registered: No matching Crossref record was present in this response. Source: Crossref; license: CC0 metadata
cautionDOI resolves: No matching Crossref record was present in this response. Source: Crossref; license: CC0 metadata
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. Source: DOAJ; license: CC0
not scoredMEDLINE indexed: Not checked or no result supplied; no credibility inference made. Source: No authority result supplied; license: Unknown
not scoredOpenAlex core source: Not checked or no result supplied; no credibility inference made. Source: No authority result supplied; license: Unknown
not scoredKnown publisher allow-list: Not checked or no result supplied; no credibility inference made. Source: No authority result supplied; license: Unknown
not scoredROR affiliation: Not checked or no result supplied; no credibility inference made. Source: No authority result supplied; license: Unknown
not scoredRetraction Watch retraction: No retraction notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete. Source: Retraction Watch; license: CC BY 4.0
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. Source: Retraction Watch; license: CC BY 4.0
not scoredRetraction Watch correction: No correction notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete. Source: Retraction Watch; license: CC BY 4.0
not scoredRetraction Watch reinstatement: No reinstatement notice matched this DOI in the deployed snapshot. No matching event found; coverage may be incomplete. Source: Retraction Watch; license: CC BY 4.0
supportingOpen access status: Normalized open-access status: open. Source: Normalized work metadata; license: Caller-provided; provenance license not supplied to scorer
not scoredPublication license: Not checked or no result supplied; no credibility inference made. Source: No authority result supplied; license: Unknown
not scoredPublication version: A publication version was supplied but is not scored. Source: Normalized work metadata; license: Caller-provided; provenance license not supplied to scorer
cautionMetadata completeness: 5 of 6 scored descriptive metadata groups are present; missing fields increase uncertainty. Source: Normalized work metadata; license: Caller-provided; provenance license not supplied to scorer

Cite this work

BibTeX

@article{allodium:10.3389/fphys.2026.1867500,
  title = {Effects of 21-day vitamin D supplementation on sports performance and exercise-induced inflammation: a randomized double-blind trial.},
  author = {Grześkiewicz K and Brzezińska P and Borkowska A and Kochanowicz A and Stankiewicz B and Piskorska E and Waldziński T and Bartík P and Antosiewicz J and Mieszkowski J},
  year = {2026},
  journal = {Frontiers in physiology},
  doi = {10.3389/fphys.2026.1867500},
  url = {https://doi.org/10.3389/fphys.2026.1867500}
}

RIS

TY  - JOUR
TI  - Effects of 21-day vitamin D supplementation on sports performance and exercise-induced inflammation: a randomized double-blind trial.
AU  - Grześkiewicz K
AU  - Brzezińska P
AU  - Borkowska A
AU  - Kochanowicz A
AU  - Stankiewicz B
AU  - Piskorska E
AU  - Waldziński T
AU  - Bartík P
AU  - Antosiewicz J
AU  - Mieszkowski J
PY  - 2026
JO  - Frontiers in physiology
DO  - 10.3389/fphys.2026.1867500
UR  - https://doi.org/10.3389/fphys.2026.1867500
ER  -

APA

K, G., P, B., A, B., A, K., B, S., E, P., T, W., P, B., J, A., & J, M. (2026). Effects of 21-day vitamin D supplementation on sports performance and exercise-induced inflammation: a randomized double-blind trial.. Frontiers in physiology. https://doi.org/10.3389/fphys.2026.1867500

Source records

pubmed · retrieved 2026-09-25T06:15:26.023Z