I bought this product in California at a pharmacy where Abreva was not available. I was at the first "twinges" of feeling a cold sore coming on. I used it immediately and often and my cold sore never really developed! And being in the hot California sun for a week no more appeared. The menthol formula was very soothing. I've ordered extra to keep on hand and also for stocking stuffers for my son who also suffers from cold sores.