DOUBLE VALUE PACK of American Biosciences, Nk-9, Ahcc Immune System Support For Dogs 250 Mg (250 mg) - Did you know that your pet"s immune system is very similar to your own? When your pets immune system is workig properly, they are well guarded. However, when your pets immune system is compromised, their resistance is lowered and their and their good health is attacked. This is particularly true for older pets because their immune system depletes naturally with age. Introducing NK - 9, Immune System Support for your pet. NK - 9 Contains AHCC (Active Hexose Correlated Compound), the ingredient that research shows can provide unsurpassed support for your pet"s immune system, especially their NK Cells - the immune system"s front - line defense. Based on more than 20 published studies and clinical experience with both humans and K - 9s, NK - 9 will help guard your pet"s health.