Mushroom Immunity Extract is a proprietary blend that is designed to balance your dog's immune system over time. When taken for an extended period of time, this can benefit your dog's ability to fight off viruses and bacteria, reduce their histamine reaction to environmental allergens, benefit their liver and kidney function and increase their general vitality. It has been documented that consuming certain medicinal mushrooms like Reishi and Turkey Tail can also help reduce the chance of cancer. All organic ingredients: Vegetable Glycerin USP, water, reishi Mushroom, turkey tail mushroom Small breeds: start with 5 drops Medium breeds: start with 10 drops Large breeds: start with 15 drops All dogs are different, in size and in their ability to assimilate nutrients. Available in a 1 oz. dropper & 4 oz. pump / closed bottles. 1 oz : (1) dropper = 1/4 tsp 4 oz : (1) pump = 1/2 tsp