WCF and Meowzi said:
kryskat said:
You can either use it when you see symptoms, or you can use a smaller amount daily. I think the daily works well to prevent symptoms and as far as I know, it's very safe.
current thinking seems to be to give it only when there are symptoms. see
this discussion on the old board.
I disagree. At least for people, there seem to be many, many sites that recommend the use as a preventative (and most people would prefer to prevent rather than treat outbreaks, I'm sure). I've also noticed that a lot of cat foods contain l-lysine, because it is an essential amino acid. Here's some more info and a link I found (there's obviously a lot more info available online):
How Do L-Lysine Supplements Work?
Viral infections grow when an individual virus takes control of a host cell and makes it use its resources to manufacture more viruses. The virus does this by injecting its DNA into the nucleus of the host cell. This strip of genetic material contains instructions that the cell's chemical machinery can use to build more viruses. The host cell, unable to distinguish between the viral DNA and its own, will continue to make more viruses until it bursts, releasing the viruses into the body to infect more cells.
An uninfected cell usually does not use much of a particular amino acid called arginine, while cells that are infected use a lot of it to make more copies of the virus. The cell's natural chemical process that uses arginine is limited by the quantity of L-Lysine (another amino acid) that's available. By giving daily L-Lysine supplements to your cat, you increase the quantity of L-Lysine available for the cat's cells to use, which means that the cell uses more arginine for its natural functions. This leaves less arginine available for the production of the cat herpes virus, thereby slowing the growth of the infection.
While the respiratory form of feline herpes is an uncomfortable and contagious infection, still more unbearable for a feline is an ocular rhinotracheitis infection. By administering a daily L-Lysine supplement, you can both help slow an already present infection in your cat, and prevent your cat from contracting future infections.
Controlling cat herpes l-lysine