A published paper is not permanent. Journals can flag a paper with a warning or withdraw it entirely. That is not science failing; it is how the record corrects itself. This guide explains the labels and shows how to check any study in a few seconds.
Two Labels to Know
| Label | What it means | Is the paper still available? |
|---|---|---|
| Retraction | The journal no longer stands behind the paper's findings. | Usually yes, clearly marked as retracted, with a linked retraction notice. |
| Expression of concern | The journal has raised questions about the paper and is alerting readers. | Yes, with a linked notice. It has not been withdrawn. |
A third label, a correction (erratum), fixes a specific error while the paper's conclusions stand.
A Real Example From the Peptide Literature
This example concerns a small, peptide-like research compound. We do not name it here, because the point is the process, not the molecule.
- 2013: a research group published a paper on a series of stabilized peptide-like analogs in a pharmacology journal.
- 2014: the same group published a follow-up reporting effects on connections between brain cells in laboratory models. It was widely cited.
- 2021: the journal published a notice of concern for the 2013 paper. PubMed also links the 2014 paper to an expression of concern.
- 2025: the journal published a retraction notice for the 2014 paper.
On PubMed, the 2014 paper now carries a "Retracted Publication" label with a link to the notice. The 2013 paper carries a link to its expression of concern. Websites and social posts can keep quoting a paper long after the journal has taken it back, which is why checking the source matters.
How to Check a Paper in About 10 Seconds
- Search the paper's title or its PMID on PubMed.
- Look near the top of the record for a "Retracted Publication" label or a retraction banner.
- Look for linked notices such as "Retraction in", "Expression of concern in" or "Erratum in".
- If you are reading a PDF or a quote, go back to the PubMed record. Downloaded copies do not update.
What a Retraction Does and Does Not Tell You
- It tells you the journal no longer supports the paper's findings.
- The retraction notice gives the journal's stated reasons. Read the notice rather than assuming.
- It does not automatically settle the wider question. Other, independent studies on the same topic stand or fall on their own evidence.
Why We Care About This
When Peptide Privé refers to published research, we link to the PubMed record so you can check its status yourself. If a paper we cite is later retracted or flagged, we update or remove the reference. For how to read the model behind a study, see Dish, Mouse or Human? Reading the Model Behind a Peptide Study.
FAQ
Is a retracted paper deleted? Usually not. It normally remains available, clearly marked, so readers can see what was withdrawn and why.
Is an expression of concern the same as a retraction? No. It is a warning while questions are open. The paper has not been withdrawn.
Does a retraction mean the authors did something wrong? Not necessarily. Papers are retracted for many reasons, including honest error. The notice explains the journal's reasons.
Sources
- 2014 paper (retracted), J Pharmacol Exp Ther. PubMed 25187433: https://pubmed.ncbi.nlm.nih.gov/25187433/
- Retraction notice, J Pharmacol Exp Ther, 2025. PubMed 40312093: https://pubmed.ncbi.nlm.nih.gov/40312093/
- 2013 paper, J Pharmacol Exp Ther. PubMed 23055539: https://pubmed.ncbi.nlm.nih.gov/23055539/
- Notice of concern, J Pharmacol Exp Ther, 2021. PubMed 34551989: https://pubmed.ncbi.nlm.nih.gov/34551989/
For in-vitro laboratory research only. Not for human or animal use.
