Abreva
"Doesn't work at all.  I've been getting cold sores for my entire life and my mom always got me Areva because it's supposed to be "the best" but it never worked- just a waste of money.  It makes your cold sore very gooey and gross.  I highly recommend Campho-Phenique Cold Sore Treatment which is a little less than $4 and works wonders."