Kill a Coldsore Before it Erupts?

I’ve heard good things about oil of oregano being applied at the first onset of the “pre-coldsore tingle.” For many, no will eruption occur if the oil is applied immediately to the tingling area. One or two drops should do, and you may have to repeat a few more times. A B complex vitamin has also been known to stop the eruption when taken at the first time of the first tingle.