here's the ultimate recipe for cold-busting:
vit A (retinol) 10,000 IU
vit C 1000 mg (at least. you can take gram after gram of the stuff)
vit E8 complex 400 IU
Se (l-selenomethionine) 200mcg
Zn 50mg (balanced w 2mg copper)
take that for a few days and vanquish the virus
then keep the whole collection around, so you can fight off future colds at the first sign.