Respir-Gold was formulated to support the health of your cat's airways, resulting in comfortable, easy breathing. The benefit of this formula is efficient flow of air into and out of the lungs, by helping to maintain normal tissues in the bronchi (airways). Respir-Gold contains the active ingredients necessary for a normal immune response in the lungs. By mediating a normal immune response, the airways are supported to be normally dilated (open) with normal amounts of mucus secretion.