Thanks for this. I have used zinc for years. Whenever I start to feel the initial stages of a flu or cold, or if I know that I have been exposed, I start high-dosing both zinc and echinacea-goldenseal. The latter provides a small boost in immunity, but I have noticed the former really helping to reduce the severity and shorten recovery. I haven't had a really bad cold or flu in several years.

Zinc is the main ingredient in Zicam, by the way.