Astragalus is a member of the legume family that has been used in Chinese medicine for thousands of years to promote strong immunity and boost “vital life energy”. It contains astragalans, polysaccharide constituents that stimulate white blood cells production, T-cells, killer cells and antibodies in a fashion that helps maintain and restore the immune system. It’s also been shown to improve the clinical signs and regulate the immune cells, cytokines and other immune-related parameters, of immunosuppressed dogs.