Cold Sore Remedy

"Lysine is an amino acid (building block of protein).  Lysine seems to prevent the herpes virus from growing." WedMD

I am susceptible to getting cold sores.  I went into a health food store because I was nearer to it than a drugstore or pharmancy, and they recommended Lysine gel applied to the lips.  Using this lysine gel has helped stop a cold sore for me better than any other thing I have ever done.  According to wedMD, a reputable website, lysine seems to be safe to use for short periods.  

It is so useful to share easy, safe remedies for common ailments.  What have you found that works for you?