"I just discovered your site.
I have used castor oil for several years to prevent cold sores primarily in the summer on the beach.
All it takes is a little massaging of the lips, for a few minutes each day, with fingers dipped in castor oil.
Also, if a cold sore appears, I have noticed a faster healing time by using the same treatment several times a day.
The longer the massage, the better the result.
The itch disappears on first contact of oil to herpes."

*Translated from French.