Abreva
"I got herpes simplex after a mean bout of shingles when I was young. I was so thankful when a product like abreva came out. I'd always used abreva after noticing a new cold sore developing and I noticed they healed slightly faster, and I was desperate for any kind of results. But this week I applied it about 15 minutes after initially feeling the tingling of an impending cold sore, and it completely disappeared overnight!!! I was ecstatic. It should be mentioned that I've always applied it far more often than the label says to, but again I'm desperate for results. I'd recommend the tube and not the pump, the pump puts out way too much, which seems ridiculous since this product is so expensive."