To prevent and treat feline herpesvirus 1 (FHV-1), a veterinary visit, some TLC, and supplementing cat food with the amino acid lysine is often recommended. But a new study suggests that may not be such a good idea.
Researchers at the University of California, Riverside conducted a literature review of the National Center for Biotechnology Information (NCBI) PubMed database to identify the efficacy of using lysine supplementation to prevent and treat FHV-1. They concluded that not only is lysine ineffective; it may, in fact, increase the frequency and severity of FHV-1.