PubMed is a free search and retrieval resource maintained by the National Library of Medicine. Its official overview describes a database of citations and abstracts from biomedical, health, and related literature. A result is a record to inspect, not a conclusion about a claim or a person.

Browser-only tool

Build a PubMed search

Enter your own terms or PubMed search syntax, then open the fixed official destination.

Use ordinary terms, a quoted phrase, PMID, or other PubMed-supported syntax. Maximum 200 characters.

0/200

PeptideHQ does not store, save, receive, or interpret your term. Nothing is submitted to PeptideHQ; the button opens PubMed directly in a new tab.

What PubMed contains

PubMed brings together citation records from MEDLINE, PubMed Central, Bookshelf, and additional selected content. The database itself does not contain journal-article full text, although a record may link to text available from PubMed Central, a publisher, or another provider. See About PubMed for the current description of its contents.

Citation

The bibliographic record: title, authors, journal, dates, identifiers, publication types, and other indexed fields.

Abstract

A summary supplied with the publication. It may omit methods, data, limitations, or details needed to evaluate the work.

Available full text

The complete article when a separate provider makes it accessible. A PubMed link does not mean the full text is hosted by PubMed or free to read.

Start with an ordinary search

Enter the main concepts in ordinary language. PubMed uses Automatic Term Mapping for many untagged searches. The PubMed User Guide explains how the service maps terms and shows the resulting translation in Search Details. Record the exact query and date so another reader can repeat the search.

Use search syntax deliberately

Quoted phrase
"research literacy" asks PubMed to look for a phrase. PubMed may report that an unavailable phrase was not found in its phrase index.
Boolean operators
Use uppercase AND, OR, and NOT. Parentheses can keep grouped concepts together.
Publication date
2020:2025[dp] searches a publication-date range. Print and electronic dates can differ.
Author
smith ja[au] limits a name to the author field. Name formats and older records can affect retrieval.
Title
"research methods"[ti] limits the phrase to citation titles.
Publication type
review[pt] searches the publication-type field. Newly added records may not yet have completed indexing.
PMID
Enter a PMID, such as 12345678, to look for that specific PubMed record.

Read publication types as labels, not quality scores

PubMed's publication-type field describes the material represented by a citation. A record can have more than one type, and some types are supplied by publishers or added during MEDLINE indexing. The label does not establish that the methods were sound, the reporting was complete, or the conclusion was correct.

  • Review identifies a form of literature review; the record still needs to be checked for scope and methods.
  • Clinical Trial identifies an interventional publication type; it does not by itself establish study quality or personal applicability.
  • Letter identifies correspondence or a letter-format publication.
  • Preprint identifies an interim research product that has not undergone peer review and may change.
  • Published Erratum or Corrected and Republished Article signals a correction-related record.
  • Retraction Notice identifies the notice, while Retracted Publication identifies the affected publication.

One citation or abstract is not complete proof

A citation confirms that a record exists. An abstract is a bounded summary, not the complete methods, results, or publication history. Evaluate the full record, follow available full-text links, compare the studied population and outcomes with the claim, and look for independent evidence. NLM's PubMed disclaimer states that database inclusion is not endorsement and that NLM does not judge the quality of individual articles.

Check corrections, retractions, and related records

  1. Open the citation's abstract page and read every notice displayed near the title and publication details.
  2. Inspect publication types and any linked comment or correction relationships, such as an erratum, expression of concern, retraction notice, or corrected republication.
  3. Follow each related record and compare its PMID, title, journal, and dates with the original citation.
  4. Search the title or PMID again if the relationship is unclear. Queries such as retraction notice[pt] and retracted publication[pt] locate those record types.
  5. Record what was visible and when it was checked; publication records can be updated.

Keep personal decisions outside the search result

PubMed results are citations, not medical recommendations. PeptideHQ does not interpret a search for an individual, rank results, or decide whether information applies to a personal health question. A personal medical question requires an appropriately qualified healthcare professional who can consider the relevant circumstances and complete record.

Source record

Authoritative sources

  1. National Library of Medicine PubMed User Guide Official instructions for searches, record fields, publication types, and correction links.
  2. National Library of Medicine About PubMed Official description of PubMed's scope and its relationship to abstracts and full text.
  3. National Library of Medicine PubMed Disclaimer Official limits on endorsement, article evaluation, and medical advice.