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Chelsea McGivney, DVM, Nestle Purina Pet Care   Reading Time: 4 mins, 17 secs.   In the past, administering L-lysine for cats was thought to be helpful in fortifying the immune system, while warding off respiratory infections – specifically, feline herpes virus, also known as FHV-1.   L-lysine for cats was thought to help alleviate:  Respiratory issues: panting, coughing, difficulty breathing Conjunctivitis (inflammation …