Anything worth taking for colds etc?

[missVN]

I'm getting really fed up with catching colds and feeling ill now. I know it's inevitable that Ryan will pick things up being around loads of kids but I've never been so ill I've hardly ever had to take time off work but already had a week off this year and at this rate I'll be phoning in sick again tomorrow

Is it worth taking multi-vits or echinacea? Or can anyone recommend anything else