Description This is the U.S. government's clearinghouse for information about clinical trials. You can search for clinical trials at this site as well as glean information that you should know - yes, should know - for your own health, before signing up to participate.
Description A clearinghouse for bio-investigational research studies in the US. You can use this page to search for those conducting studies and for the various protocols. Other similar sites that are affiliated with the FDA are the Department of Scientific Investigations (with an accompanying list of approved, restricted, and unapproved researchers) and the Center for Drug Evaluation and Research.
Description This is a commercial site that seeks to serve as a resource to find clinical trials in your area. It serves both professionals and laypersons. It's a very easy to use site that has a lot of information.
Before signing up for any clinical trial, please see ClinicalTrials.gov, as well. This is the site of the Clinical Trials area of the US National Institutes of Health.
Clinical trials are an industry. Do not assume that your safety is always the foremost consideration. Sadly, I fear, at times it is not. Having said that, trials are an absolutely essential and invaluable part of the process of developing new treatments. Just do your homework before signing on the bottom line and try to understand as much as possible about the trial you are interested in.