This is the first thing I reach for when I'm feeling like I might be coming down with the flu. At the very first sign of body aches, fatique, a bit of fever or chills, I start taking it and I swear it helps me kick it or make it a whole lot better. Each dose is a tiny plastic tube of sweet little beads that are absolutely all natural and no drug interactions whatsoever. You can even give these to kids ages 2 and up! I've seen it sold in a lot of places but Trader Joe's has it at such a good price -- $9.99 I think. I tell all my friends about this and most of my family uses it too.