If you have ever had a cold sore you know the itching, burning, tingling feeling you get before the cold sore appears. It probably accompanies a feeling of anxiety – particularly if you have an important event or meeting in the near future.

Zeno CS works best when used early, when a cold sore starts. A 4-minute treatment, applied every 4 to 6 hours, ends most cold sores. In clinical trials, most cold sores healed in 3 days or less.