L-Lysine 500mg — Immune & Respiratory Support for Cats
PurePalsLab Formula #006 delivers a therapeutic dose of 500mg L-Lysine hydrochloride per chew. L-Lysine is an essential amino acid that competes with arginine — a compound required for feline herpesvirus (FHV-1) replication — providing targeted support for cats exposed to this ubiquitous pathogen.
Active Compound & Mechanism
| L-Lysine Hydrochloride 500mg | Competitive inhibitor of arginine utilization by FHV-1; supports reduced viral replication and symptom severity |
Clinical Context
Feline herpesvirus type 1 (FHV-1) is estimated to affect 80-90% of the global cat population. While many cats remain asymptomatic carriers, stress, illness, or immune suppression can trigger viral reactivation — manifesting as conjunctivitis, rhinitis, sneezing, and ocular discharge.
Research published in the American Journal of Veterinary Research demonstrated that cats supplemented with L-Lysine showed reduced severity of conjunctivitis and respiratory symptoms during FHV-1 flare-ups.
Dosing Protocol
Cats of all sizes: 1-2 chews daily. For optimal results, administer consistently each day. Fish flavor formulated for feline palatability.
Note on Quality
Our L-Lysine is USP-grade, verified for purity via HPLC analysis, and manufactured without artificial colors, flavors, or preservatives.
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Reviews
There are no reviews yet.