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Grey Literature in the Health Sciences: Clinical Trials / Guidelines / Regulatory

Describes what grey literature is, why it is important to search it, how to focus your search, which resources are available to search, and how to evaluate grey literature. License: Creative Commons Attribution-NonCommercial Share Alike 4.0 International.

Clinical Trials Resources

Trial registries can be used to search for protocols and to identify unpublished studies and outcomes.  Resources with the broadest global perspective are listed first.  

Source Guide: USC (see link and license below)

Selected Clinical Guidelines Resources

Source Guide: partially drawn from McMaster University

Regulatory Information

Clinical and statistical reviews can provide information on directions for use, efficacy and effectiveness, and safety.  Some of the more commonly searched resources are listed below.

Source guides: USC and Wichita State

Regulatory Information - FDA

FDA resources are some of the main resources to search for grey literature, particularly for documents about unpublished clinical trials. The most commonly searched resources are Drugs@FDA and Devices@FDA.

Source guides: USC and Wichita State (see links and license below)

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Permissions and License Information

We gratefully acknowledge that the content of this guide (including links, descriptions, and selected categories) is reused/remixed from the following guides and sources under a Creative Commons Attribution NonCommerical ShareAlike 4.0 International License.

Confirmation of the Creative Commons status of the entire USC guide was also sought and received in writing from the USC Guide Author Karin Saric on 11 July 2019. Reuse permission was granted provided attribution is given.

Creative Commons License