Immune system: Immunocal? Any good?

I'm two weeks into bad cold, feeling lousy, and wondering if I can even hear someone sneeze in the distance without coming down with something. A friend just recommended a product called Immunocal (not sure if that's spelled correctly) to boast immune system. She claims that a friend, who had ovarian cancer, used it throughout chemo, etc. and felt great and hasn't been sick since.

I'm sure if this is really a miracle product someone on the board has heard of it. I gather that it is from Canada. Any information, recommendations, including info about how/where I can get it, would be appreciated.

Or anything else that can help me avoid these month-long colds I've been getting. Thanks.