Docosanol
"It's a scam and a total waste of money, all cold sores will start healing itself in 3 days. I speak from 70 years of experience. Save your money. When I feel the first tingling of a cold sore I use Blistex and use it continually for 2 or 3 days and the blister doesn't even form. It's quite obvious that you don't accept comments that are truthful and affect your monetary bottom line. Another evidence of a scam."