Immune support L-Lysine supplement Chews and powder are vet quality supplements that support your cats immune system, respiratory system and eye health.ctive L-Lysine Hydrochloride 500 mg. Inactive Arabic Gum, Brewers Yeast, Calcium Propionate, Citric Acid, Corn Syrup, Cranberry Fiber, Dried Cheese, Dried Chicken, Fish Oil, Glycerin, Hickory Smoke Flavor, Lecithin, Polyethylene Glycol, Sorbic Acid, Spray Dried Liver Powder, Vegetable Oil, Water, Wheat Flour." Ingredients:",ctive L-Lysine Hydrochloride 500 mg. Inactive Arabic Gum, Brewers Yeast, Calcium Propionate, Citric Acid, Corn Syrup, Cranberry Fiber, Dried Cheese, Dried Chicken, Fish Oil, Glycerin, Hickory Smoke Flavor, Lecithin, Polyethylene Glycol, Sorbic Acid, Spray Dried Liver Powder, Vegetable Oil, Water, Wheat Flour.