Pet Honesty's Immune Health Lysine For Cats helps to support your cat's immune system and respiratory health with a powerful blend of natural ingredients. This supplement contains Vitamin C, lysine, and echinacea that work together to help strengthen your cat’s natural defenses. The easy-to-feed soft chews are grain-free and delicious, so your cat will love them. Give your cat the immune health support it needs to stay happy and healthy with Pet Hon