If the cold is caused by bacteria, not a virus, then you can help it go away with probiotics. They populate your colon with good bacteria that fights the bad stuff. When I fly, I take two or three, and then during the flight, I take one every hour. I haven't had a cold in years, but I also try to be mindful of putting my hands in my eyes or mouth. The probiotic I use is Culturelle, which, they say, is engineered to make it through your stomach acid into the colon. There are other brands on the market. The most it can do it give you a little gas if you're not used to it, but if you start taking it daily, it ceases to become a problem.