ClinicalTrials.gov recruitment status: what every label means

01

Start with overall status, then inspect each location

ClinicalTrials.gov defines an overall recruitment status for the entire study and can also show a status for individual facilities. The protocol definitions say that if at least one site in a multisite study is recruiting, the overall status must be Recruiting. That does not mean every listed location is open.

A consumer looking for a peptide or GLP-1 study should open the Locations section and confirm the specific site's status and contact information. ClinicalTrials.gov notes that contact details are generally shown only for open studies and may not be current when a record has Unknown status.

An NCT number and a Recruiting label mean the study has a public registry record and is seeking participants under the described conditions. They do not mean FDA approved the investigational product, validated a sponsor's marketing claim, or determined that enrollment is appropriate for a particular person.

02

Open statuses: not yet recruiting, recruiting, and invitation only

Not yet recruiting means participant recruitment has not begun. The record can exist before enrollment starts, and ClinicalTrials.gov guidance says required human-subjects review must be obtained before a study that needs it changes to Recruiting. A projected start date can move, so check the last verification date.

Recruiting means participants are currently being recruited, whether or not anyone has enrolled yet. Confirm eligibility, location, contact, sponsor, and study dates through the registry and study team. Do not pay a third party merely for access to a public contact unless you understand the service being sold.

Enrolling by invitation means participants are selected from a predetermined population. It is not open public recruitment. A sponsor press release saying a trial is 'enrolling' may therefore describe a narrower pathway than a reader expects; use the exact registry label and location details.

03

Continuing and normally finished studies

Active, not recruiting means participants are still receiving an intervention or being examined, but no new participants are currently being recruited or enrolled. The study may still be collecting primary, secondary, safety, or follow-up data. This label does not disclose whether an interim analysis was favorable.

Completed means the study concluded normally and participants are no longer being examined or treated for the study—that is, the last participant's last visit occurred. Completion is an operational milestone. It does not mean the planned enrollment was achieved, every endpoint was met, results were posted, a manuscript was published, or FDA approved the product.

Compare status with the actual or estimated primary and study completion dates. Then look for posted summary results, linked publications, protocol documents, statistical analysis plan, and any FDA action. Those records answer different questions and may appear at different times.

04

Suspended, terminated, and withdrawn are not synonyms

Suspended means enrollment or participant activity stopped early but may resume. Terminated means the study stopped early and will not start again; participants had already enrolled. Withdrawn means the study stopped before its first participant enrolled. ClinicalTrials.gov requires a Why Study Stopped explanation for these premature-stop statuses.

Read that explanation verbatim and in context. Reasons can include safety, lack of efficacy, operational issues, recruitment difficulty, funding, manufacturing, strategy, or an external event. A short sponsor-entered sentence may not establish causality, severity, or a regulator's conclusion.

Do not equate Suspended with an FDA clinical hold. A sponsor may pause a study for many reasons, and an FDA hold is a separate regulatory action. Conversely, do not describe a terminated trial as evidence that a substance is universally unsafe without reviewing the reason, protocol, event data, and authoritative regulatory information.

• →Suspended: stopped early and may resume
• →Terminated: stopped early after enrollment and will not resume
• →Withdrawn: stopped before the first participant enrolled
• →Completed: ended normally according to the protocol

05

Unknown status and stale records

ClinicalTrials.gov uses Unknown for certain studies whose last known status was Recruiting, Not yet recruiting, or Active, not recruiting, whose completion date has passed, and whose status has not been verified within the prior two years. The platform considers these closed studies for search purposes.

Unknown does not tell you what actually happened. The study may have completed, stopped, moved, or simply not been maintained. Check the last known status, record verification date, last update posted, anticipated completion dates, study history, sponsor website, publications, results postings, and regulator records.

Record maintainers are responsible for completeness and accuracy. ClinicalTrials.gov says recruitment-status changes for covered records should be updated within 30 days, while other information has periodic review requirements. A stale record is a reason to qualify a claim, not permission to invent a current status.

06

A five-minute peptide trial verification workflow

Search the exact molecule and synonyms, then record the NCT number, official title, sponsor, study type, phase, intervention, comparator, population, and overall status. Open the locations and confirm whether the site relevant to you is actually recruiting. Review eligibility with the study team and your own licensed clinician; a directory cannot determine eligibility.

Next capture the verification date, last update, primary and study completion dates, planned and actual enrollment, stop reason if present, outcome measures, results status, documents, and linked publications. Use the history link to see whether dates, outcomes, enrollment, or status changed.

Finally check FDA sources before repeating approval or safety claims. A registered, recruiting, active, or completed study can still involve an investigational substance. Avoid sellers that use an NCT number as an approval badge or offer a study product outside a legitimate trial and clinical pathway.