Immune Mushroom Blend for Dogs by Sustenance Herbs is a great addition to any medicine cabinet, for when your pet needs that extra boost for their immune system. A blend of 14 Organic USA grown mushrooms to our major immune modulating herbs that work in synergy to balance the immune system. Scavenges for free radicals which may help protect the body cells and tissues. Contains Antioxidants. Promotes normal blood values, enhances cellular health, and helps reduce oxidative stress.