I really don't think so. I took it once and it did nothing, and i got so sick and stayed that way for 3 weeks. The second time i took it, i didn't get sick and felt great. I think the first time i took it, i already had the cold/flu and didn't know it yet, since we have to take it at the first sign of a cold...
I still think the product works when used as directed. FDA/Big pharma has nothing better to do than continually go after the little guy and make yet another good product go bye bye.