Additionally if you're having an outbreak then be conscious of 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 foods. I do know that I've not had a chilly sore since taking these. I've been taking a different lysine product (a thousand mg daily). This is THE ONLY lysine product I exploit on a regular basis