If you have had cold sores, you know that dreaded tingly feeling. That is when you have to use this stuff. You must apply it at the first indications of a cold sore developing, or its effectiveness is compromised. In my experience, when used accordingly, it has completely arrested the development of the cold sore. Compared to Abreva or Camphor-Phenique, it is hands down the best.
The product itself is a brown, runny liquid. It is dispensed in a teeny plastic squeeze bottle, so I just give it a gentle squeeze, and smear my lips around till it covers all the tingly area. It dries to a clear finish very quickly. You are directed to apply it 2 to 4 times a day, and it's touted as a 1-day cold sore treatment, but I always give it a couple days before I feel safe enough to not use it.
For the record: Releev, and the company who produces it, is absolutely and blissfully ignorant of my existence on this planet, and I received no compensation for my hearty endorsement of their product.