Pet Naturals L-Lysine Chews Cats, Immune Respiratory Support Supplement, 60 Bite Sized Chews (3.74oz) L-Lysine from Pet Naturals comes in a delicious chicken liver bite sized chew that cats love! Lysine is recommended for cats that need added immune support, respiratory health support and for other conditions that are responsive to lysine. L-Lysine from Pet Naturals contains no wheat, corn or artificial ingredients. L-Lysine is great for multi cat households Pet Naturals of Vermont products are veterinarian formulated and manufactured in the USA.