This has a place in your cold sore arsenol
This product does not do much to stop the sore from forming (prescription meds, Abreva, and lysine are better for this), but if a cold sore catches you off guard and forms, this is the best thing for drying it out.  I especially find it useful for an off-the-lip cold sore with distinct blisters.  This tried and true med has been around forever for a reason.  Once you dry out the sore and it stops hurting, you should switch to a moisturizing treatment.
Rating: 5 stars