Directory / Research databases / HDB-0011

ClinicalTrials.gov

US National Library of Medicine

HDB-0011

The world's largest registry of clinical studies, spanning interventional trials and observational studies in 200+ countries, with protocols, eligibility criteria and posted results. Fully open with a modern REST API.

Category

Research database

Access

Open access

Cost

Free

Region

Global

Coverage

Clinical studies in 200+ countries

Size

450K+ registered studies

License / terms

Public domain (US government)

Data types

trial registrations, protocols, results, eligibility criteria

clinical trials API drug development registry

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Record HDB-0011 · last verified 2026-08-05 · listed in Research databases

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