North Hound Life Organic Turkey Tail full-spectrum mushroom extract (grown by organic traditional cultivation) may support your dog's immune system. This hot-water-extracted mushroom is a great source of antioxidants and may balance your dog's digestive system & help maintain a healthy immune system. Organic traditional cultivation ensures the mushrooms are full of phytonutrients and beta-glucans. Research shows the PSP extract from Turkey Tail mushrooms may provide longer survival times for dogs with hemangiosarcoma and may reduce hemangiosarcoma tumor size in dogs by as much as 34%.