I am an excellent candidate for a clinical trial...

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Anybody know anything about how these things work? The nurse called me yesterday, and said that I would be an excellent candidate, but I have no idea what any of it entails. I'm having a meeting with her this afternoon, and she said she'd go over everything with me. Is this a good idea to do? I'm imagining myself as a guinea pig or something. I don't want to take something that could make my health worse instead of better. I really don't know what I'm getting into. Opinions???