I run a cat sanctuary in Oregon and have too many kitties exhibiting signs of the Herpes virus--dark discharge from the eyes. The Animal Eye Doctor recommended this product and sold me a small container of it. It would have been way too expensive and inconvenient to continue buying it from her directly, and none of my local health food distributors carried the granules, so I was thrilled to find the same product online at such a terrific price. And, it was packaged in bulk too for a reduced price!
I've only been using it for a couple months, and have been told L-Lysine takes a while to build up in a cat's system before it can be effective, so results are inconclusive as of now, but if it works, I'll be buying lots of this stuff for the long-term.