Hi, all my life I have had canker soars, had them cut out an analyzed, not herpes. Finally i as listening to the Alex Jones show and one of his call in, indicated to try Collidal Silver, nano-30 ppm. Wow, it really works, I had a stressful sitiuation, taxes, and begin to get a sore. Took the silver and it s gone. I can t believe it. Other people have indicated this also.