Grey literature

Clinical trial database that contains thousands of currently enrolling trials. Information on drugs and new medical therapies are available to review. CenterWatch also provides patients with health and educational resources about clinical trials and other health information.

Database of publicly and privately funded clinical trials in the USA

The Cochrane Central Register of Controlled Trials (CENTRAL) is a highly concentrated source of reports of randomized and quasi-randomized controlled trials.

A aatabase containing clinical trials conducted in the European Union and the European Economic Area, as well as trials that are linked to European paediatric medicine development.

World Health Organisation's clinical trial registry - search to find internation clinical trials.

A Canada-based cooperative oncology group, which carries clinical trials in cancer therapy, supportive care and prevention across Canada and internationally.

aims to locate, match, and share all publicly accessible data and documents, on all trials conducted, on all medicines and other treatments, globally.