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  1. Lysine for cats is often recommended as a way to boost the immune system and lessen upper respiratory symptoms such as sneezing, congestion, and runny or red eyes. But while lysine supplements are readily available over the counter, they shouldn’t replace modern medicine.
    www.petmd.com/cat/general-health/lysine-for-cats
    L-Lysine is an important dietary supplement for cats because not only does it treat feline herpes but it also helps to prevent the symptoms. Feline herpes is highly contagious amongst cats causing upper respiratory infections and a painful eye discharge called conjunctivitis that can lead to blindness.
    www.entirelypets.com/cat-lysine.html
    The MSD veterinary manual suggests a dose of lysine of 250 mg by mouth, 2 to 3 times a day. However, it’s really important that you only dose your cat as instructed by your veterinarian. You should never give lysine, or any medicine or food supplement, to your cat without checking with your veterinarian first.
    thevets.com/blog/lysine-for-cats/
  2. L-lysine for Cats: Overview, Dosage & Side Effects

  3. 10 Best Lysine Supplements for Cats in 2025 – Reviews & Top Picks