It can start with a tickle in the throat, that achy-all-over feeling, or a cough and runny nose that lets off the moment you step into a room full of people. This winter, cold and flu viruses are everywhere, and by now, everyone wants to just be well for a little while. What can you have on the shelf to help strengthen your immune system and prevent symptoms from showing up and sticking around? What are the natural remedies that can help keep you healthy?