Do l-lysine works for herpes?

Maybe, but uproven: There are some non-medical "treatments" such as lysine that may lower the frequency of outbreaks, and some over-the-counter medications that can help with healing of cold sores. There are usually only a handful of research studies on each product, which doesn't mean much in the medical world. A patient can collect information and visit his doctor to see if any of the "treatments" are worth trying.

It does not: Tissue culture studies show that the yield of herpes simplex is lower with more lysine but only lower, not inhibited from growing.