The best you can do is a moderate ride to increase your body temperature, some cold viruses die quickly at elevated temperatures.

Zicam, vitamin c, etc. have all been tested in proper studies and found to have to no efficacy against the common cold. Pure placebo effect.
These products all work on the same concept: the average cold virus takes three days before the body removes it, so you feel sick on day one, take whatever on day two, you'll feel better on day three.
There is not a single product on the market that is effective against the common cold, so save your time and money.