Participants will use Herpecin L Everyday Protection lip balm.

Participants will not use any cold sore products or lip balms.

Participants in the Herpecin L arm will use the test product daily as a preventive product by applying the product twice daily. Also, participants will be told they can reapply the product if going outside into the cold, wind, or sun. If participants in the Herpecin L arm do experience a cold sore or fever blister, they will be instructed to use the product at the first sign of the cold sore and then at least four more times during the day until the cold sore is gone (they can use the product more often if they plan to go outside into the cold, sun, or wind).

Cold sore severity will be measured via survey and cold sore severity grading. Symptom severity is rated on a scale of 0 (Not a problem) to 6 (Severe)

Cold sore frequency will be measured via a self-reported survey measuring the frequency of cold sore occurrence during the study period compared to baseline.