OK, this is going to sound totally stupid. But I don't do anything at all really, because I believe that if I am exposed to the things that are normally going around that I will build up an immunity to them.
That said, I did have a surgery scheduled once and started getting a cold, and totally derailed the cold by drinking literally GALLONS of liquid the 2 days before the surgery!
That said, I did have a surgery scheduled once and started getting a cold, and totally derailed the cold by drinking literally GALLONS of liquid the 2 days before the surgery!