Check the listing for details. VetriScience L-Lysine Pro for Cats- Immune System Support for Felines (120chews). Condition: New. Listed at 36.48 USD. Brand: VETRISCIENCEVetriScience L-Lysine Pro for Cats - Immune System Support for Felines - 120 Small Soft Chews L-lysine Pro supports immune system function, eye and respiratory health. As an important component of many proteins, l-lysine supports antibody, hormone and enzyme production. It also promotes healthy growth and development by supporting the production of collagen. L-lysine and the amino acid l-arginine compete for the same receptors in the body. L-arginine is required for the replication of the herpes virus. With twice the lysine of vetri lysine plus, and the addition of dmg, l-lysine Pro offers advanced support for cats.Supports antibody, hormone, and enzyme productionSupports production of collagen, promoting healthy growth and DevelopmentL-lysine is an essential amino acid required by cats. As an important component of many proteins, l-lysine supports antibody, hormone and enzyme production