I've stayed cold free for over 3 yrs using Airborne.....just the slightest hint of a bug I take it.
I felt a cold coming on Monday and hit it with Airborne, and Vitamin C. These work best for me at the first signs of a cold. There are a bunch of new flavors on the shelves now. If you already have the bug Airborne and vitamin C seem to help shorten the life of my colds. Good luck.