I think it depends on the site. In my case, I actually was recruited—my doctor passed my name onto a study coordinator and said I might be a fit.

But when I was looking into it, the hospital system has a webpage that lists all their clinical trials, description and contact information for how to get in touch if interested.

If you see some in your area, maybe you can find a similar clinical trial page on the website for the site that’s doing the research.