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NK-9® is the #1 natural health secret that keeps pets healthy and happy! NK-9’s ingredient, AHCC, supports a pet’s immune system by increasing natural killer (NK) cell activity. NK-cells are the most important white blood cell in the immune system. Their main role is to patrol the body, seeking and destroying any harmful cells that threaten your pet’s physical well-being. Nothing defends your pet’s health better than NK-9!*