I have suffered from cold sores for years, mostly in my teenage years. I have used B-Complex and found that helpful to take a few times a week and my occurrences subsided. Then I discovered using Spirit of Camphor on the end of a q-tip or cotton ball helped dry them once they began. Now I strictly use L-Lysine as soon as I get an 'itchy' feeling that one is one the way. I take about 1000 mg per day for 2 days and the cold sores rarely come to a complete break out. Earlier this year I began to eat a good, healthy, balanced diet and haven't had a break out in months.. Healthy living is the best way for most issues, in my opinion.