oh dear, where to start. my guess is cold-fx is a multi-vitamin that relies on studies that show certain vitamins and minerals have increased the immune system.
anyone remember the mass vitamin craze started i believe by robert cathcart in the 70's or 80's i think who worked on breaking vitamins down to a molecular level? he took massive doses of vitamin C to aid his immune system. zinc maybe another one in this "common cold cure" called cold-fx.
you are not going to get any benefit by having extreme doses of a vitamin or mineral. yes you need adequate intake, but not many many times the RDA. massive doses of vitamin C have not been shown to increase the immune system when compared to the RDA of vitamin C and i'm fairly sure similar studies on other immune system vitamins/minerals have been done. vitamin and minerals are important, but extreme doses are not going to make you super human and some vitamins/minerals do you serious damage in extremely large doses.
i'm speculating of course. but i'm guessing this is what it is by the wording cold-fx uses. it's either that or a placebo sugar pill (or both). either way, they'll likely try to gain credibility with flawed and/or outdated studies.
i'm jumping the gun a bit, but predictions are fun!

it's not a cure though, thats for sure, you can tell by the wording alone as they talk about immune system protection(which is questionable), not a cure. exercising will improve your immune system, laughter, friends and generally being happy and active. i can feel the fx of cold-fx already.