Where this data comes from

ClinicalTrials.gg is an independent project. It is not affiliated with, endorsed by, or operated by the NIH, the National Library of Medicine, or ClinicalTrials.gov.

The registry is the authority for every record. Where this site and the registry disagree, the registry is right and we have a bug — every study page links to its own source record so that is always one click away to check.

ClinicalTrials.gov posts changes on weekdays, at around 09:00 US Eastern. We ingest after that, every weekday. The newest update we currently hold was posted on 2026-09-25.

Pages are cached for an hour, so a change posted by the registry can take up to an hour longer to appear here. A record that has fallen further behind than a few days means our ingest is lagging, not that the registry stopped publishing.

Each study page carries its own last-updated date, taken from the registry record rather than from when we rendered the page.

No values. We do not edit, correct, summarise or reinterpret what a sponsor filed. The changes are presentational:

• Registry text arrives as Markdown and is rendered as formatted text rather than shown as raw markup.
• Eligibility criteria arrive as a single block. We split it into inclusion and exclusion lists where the shape is unambiguous, and show it whole where it is not — about 1 record in 16, usually because the criteria repeat per sub-cohort.
• Studies are grouped by the registry’s own derived MeSH condition terms, not by the free-text condition strings, which run to over 120,000 distinct spellings.
• Any summary sentence at the top of a study page is assembled by template from the record’s own fields. Nothing on this site writes prose about a study.

Some records are far too large to render whole. Where we cut something, the page says so and gives the true total:

• At most 100 study locations are listed. The largest record in the registry has 3,511.
• At most 8 baseline measures, and 10 adverse events per group.

Records the sponsor has withheld — a provision the registry allows for some device trials, where every descriptive field reads “[Redacted]” at the source — still resolve at their own URL, but we do not list them in search results or submit them to search engines. There is nothing in them to find.

The discussion on each study page is ours, not the registry’s — it is the reason this site exists. Comments are written by visitors and are not reviewed by the study team unless a comment carries a study team badge.

That badge is verified against the registry itself: it is granted only to someone who can receive email at the contact address published on that study’s own record, and it is withdrawn if the registry later lists a different address.

Nothing here is medical advice, and a study appearing on this site is not a recommendation to join it. Trial records describe what a sponsor intends to study, not what is known to work. Talk to your doctor about whether a study is right for you.

If something here looks wrong, check the source record first — the link is in the sidebar of every study page. If it differs from what we show, that is our error and we would like to know.