I do know that I’ve not had a cold sore since taking these. Also in case you’re having an outbreak then take heed to the L-Arginine to L-Lysine ratio in your food plan you possibly can look on-line for charts with the ratio of L-Lysine to L-Arginine in several foods. I’ve been taking a unique lysine product (a thousand mg every day). That is THE ONE lysine product I use frequently