I'm particularly interested in the statement at the bottom of the box - "Use before exposure to viruses or the 1st signs of cold". How do you know that you're about to be exposed to viruses?
Viruses, or virii (to use the proper term), typically measure somewhere between 104 and 109 nanometres in size. You can't see them, just like you can't see bacteria (even though they're 500 times bigger).
My wife is currently studying a science course, so I asked her how you could detect if a virus was heading for you, and she obligingly came up with a solution. Apparently if you have a scanning electron microscope, you could take a sample of something and indeed then scan it to see if there was a virus there waiting to expose itself to you. Of course you'd need several thousand pounds to buy one, but no solution is perfect.
In other news, I've done an entry for the BBC Radio New Comedy Awards 2016, and it'd be kinda cool if people had a listen and perhaps even "like" it on Soundcloud (assuming that you do like it)
