I've been bedridden and out of work for a couple of days now with a cold I dragged back from the U.S. I must not be used to the germs there, because this one has floored me more than usual. I think I caught it from my father, who was over it in 12 hours.
With little else to do, I've been thinking about all of the proposed cures. My mother's latest preventative, if not cure, is to take a protein drink a day. Yes, the same stuff bodybuilders drink to "bulk up." My very thin mother needs to bulk up, I don't. My wife Theresa swears by Echinacea, an herbal remedy. I believed it worked if I started taking it just at the beginning of a cold, but it hasn't touched this one as far as I can tell. Vitamin C is one of those cures that only seems to work if you believe it does, same with Zinc. The Wikipedia article on the Cold lists a few more, albeit similarly iffy, cures.
For now, the only cure I've found is to sleep through it.