Cold remedy?

I'm not real big on taking any kind of medicine, but when a nasty cold strikes I'd do anything to make it better. I've been coming down with a cold for the past week after running myself into the ground. I just don't have time to be sick! So, I was rummaging through the medicine cabinet and came across this box of Zicam. It claims to reduce the severity and duration of a cold. At that point I would have tried anything. I'm still a bit skeptical, but I think it really may have helped. The problem is, you never really know if your cold was going to get better without the medicine? I don't know. Just wondering if anyone else has tried this stuff out?