Does lysine help prevent cold sores?

I focus on the triggers first, lysine is a maybe on top.

Lysine seemed to help me a bit but daily SPF helped far more.

Mixed results here, some months it seems to work, some not.

Thanks for posting. The thing I wish I had learned sooner is to respect the early tingle window and to protect proactively rather than wait. Keep the lips shielded on high UV and cold days, protect your sleep, and be kind to yourself. This is a support space and for a clinical read you can use the Clinic.