It doesn't work for everyone, that's a given. I mean, what does? Also, not all colds are the same, if fact you'll never get the same cold twice, so hey, it may not always work, but keep some in your house and take it when you get a cold. If it works on that cold, great, if not, better luck next time.
I have to wonder if anyone got diarrhea by taking the stuff you swallow. I got it last time, though zinc is supposed to reduce diarrhea. I'm just curious.
Best of luck with your colds everyone!