ClinicalTrials.gov is a database of publicly and privately supported clinical studies of human participants conducted around the world. ClinicalTrials.gov is provided by the US National Library of Medicine.
International Standard Randomised Controlled Trial Number (ISRCTN) Register
The ISRCTN registry is a primary clinical trial registry recognised by WHO and ICMJE that accepts all clinical research studies (whether proposed, ongoing or completed), providing content validation and curation and the unique identification number necessary for publication. All study records in the database are freely accessible and searchable.
Trials Register of Promoting Health Interventions (TRoPHI)
The Trials Register of Promoting Health Interventions (TRoPHI) is unique in its focussed coverage of trials of interventions in health promotion and public health worldwide. It covers both randomised and non-randomised controlled trials.