Does have a dark side?, a database maintained by the National Library of Medicine at the National Institutes of Health, lists research studies involving human subjects. Certain types of studies are required to be listed at, and, per the website, study registrations have increased as more sponsors and investigators voluntarily register their studies.

But as interesting as the information it contains might be, what omits also may be of interest to potential research subjects. A recent Washington Post article discusses some of these concerns, and points out that while NIH may maintain the database, it does not independently vet listings for completeness or accuracy.