wikipedia.orgAlso when you’re having an outbreak then take heed to the L-Arginine to L-Lysine ratio in your diet you’ll be able to look online for charts with the ratio of L-Lysine to L-Arginine in different meals. I do know that I’ve not had a cold sore since taking these. I have been taking a special lysine product (one thousand mg every day). That is THE ONLY lysine product I use on a regular basis